removed symlink creation

.gitignore

@@ -17,6 +17,7 @@
 .idea/
 .editorconfig
 *.user
+*.DotSettings
 
 #backups
 .old*/

Mlaumcherb.Client.Avalonia/Config.cs

@@ -0,0 +1,75 @@
+using Mlaumcherb.Client.Avalonia.зримое;
+using Mlaumcherb.Client.Avalonia.классы;
+using Mlaumcherb.Client.Avalonia.холопы;
+
+namespace Mlaumcherb.Client.Avalonia;
+
+public record Config
+{
+    [JsonRequired] public string config_version { get; set; } = "1.0.0";
+    public bool debug { get; set; } = 
+#if DEBUG
+        true;
+#else
+        false;
+#endif
+    public string player_name { get; set; } = "";
+    public int max_memory { get; set; } = 4096;
+    public string minecraft_dir { get; set; } = ".";
+    public bool download_java { get; set; } = true;
+    public bool redirect_game_output { get; set; } = false;
+    public string? last_launched_version { get; set; }
+    public int max_parallel_downloads { get; set; } = 16;
+    public GameVersionCatalogProps[] version_catalogs { get; set; } =
+    [
+        new() { name = "Тимериховое", url = "https://timerix.ddns.net/minecraft/catalog.json" },
+        new() { name = "Mojang", url = "https://piston-meta.mojang.com/mc/game/version_manifest_v2.json" },
+    ];
+
+    
+    [JsonIgnore] private static IOPath _filePath = "млаумчерб.json";
+    
+    public static Config LoadFromFile()
+    {
+        LauncherApp.Logger.LogDebug(nameof(Config), $"loading config from file '{_filePath}'");
+        if(!File.Exists(_filePath))
+        {
+            LauncherApp.Logger.LogDebug(nameof(Config), "file doesn't exist");
+            return new Config();
+        }
+
+        string text = File.ReadAllText(_filePath);
+        string errorMessage = "config is empty";
+        Config? config = null;
+        try
+        {
+            config = JsonConvert.DeserializeObject<Config>(text);
+        }
+        catch (Exception ex)
+        {
+            errorMessage = ex.Message;
+        }
+        if (config == null)
+        {
+            IOPath _brokenPath = _filePath + ".broken";
+            File.Move(_filePath, _brokenPath, true);
+            ErrorHelper.ShowMessageBox(nameof(Config), 
+                $"Can't reed config file '{_filePath}'.\n" +
+                $"New config file has been created. Old is renamed to '{_brokenPath}'.\n\n" +
+                $"Config parser error: {errorMessage}");
+            config = new Config();
+            config.SaveToFile();
+        }
+
+        LauncherApp.Logger.LogDebug(nameof(Config), $"config has been loaded: {config}");
+        return config;
+    }
+
+    public void SaveToFile()
+    {
+        LauncherApp.Logger.LogDebug(nameof(Config), $"saving config to file '{_filePath}'");
+        var text = JsonConvert.SerializeObject(this, Formatting.Indented);
+        File.WriteAllText(_filePath, text);
+        LauncherApp.Logger.LogDebug(nameof(Config), $"config has been saved: {text}");
+    }
+}

Mlaumcherb.Client.Avalonia/GameVersion.cs

@@ -0,0 +1,189 @@
+using System.Linq;
+using System.Security.Cryptography;
+using CliWrap;
+using DTLib.Extensions;
+using Mlaumcherb.Client.Avalonia.зримое;
+using Mlaumcherb.Client.Avalonia.классы;
+using Mlaumcherb.Client.Avalonia.сеть;
+using Mlaumcherb.Client.Avalonia.сеть.TaskFactories;
+using Mlaumcherb.Client.Avalonia.холопы;
+using static Mlaumcherb.Client.Avalonia.холопы.PathHelper;
+
+namespace Mlaumcherb.Client.Avalonia;
+
+public class GameVersion
+{
+    private readonly InstalledGameVersionProps _props;
+    public string Id => _props.Id;
+    public IOPath WorkingDirectory { get; }
+
+    private IOPath JavaExecutableFilePath;
+
+    private GameVersionDescriptor _descriptor;
+    private JavaArguments _javaArgs;
+    private GameArguments _gameArgs;
+    private Libraries _libraries;
+    private CancellationTokenSource? _gameCts;
+    private CommandTask<CommandResult>? _commandTask;
+
+    internal GameVersion(InstalledGameVersionProps props, GameVersionDescriptor descriptor)
+    {
+        _props = props;
+        _descriptor = descriptor;
+        _javaArgs = new JavaArguments(_descriptor);
+        _gameArgs = new GameArguments(_descriptor);
+        _libraries = new Libraries(_descriptor);
+        WorkingDirectory = GetVersionDir(_descriptor.id);
+        JavaExecutableFilePath = GetJavaExecutablePath(_descriptor.javaVersion.component, LauncherApp.Config.debug);
+    }
+
+    public async Task Download(bool update, Action<NetworkTask> networkTaskCreatedCallback)
+    {
+        LauncherApp.Logger.LogInfo(Id, $"started updating version {Id}");
+        
+        List<INetworkTaskFactory> taskFactories =
+        [
+            new AssetsDownloadTaskFactory(_descriptor),
+            new LibrariesDownloadTaskFactory(_descriptor, _libraries),
+        ];
+        if (LauncherApp.Config.download_java) 
+            taskFactories.Add(new JavaDownloadTaskFactory(_descriptor));
+        if (_descriptor.modpack != null) 
+            taskFactories.Add(new ModpackDownloadTaskFactory(_descriptor));
+        // has to be downloaded last because it is used to check if version is installed
+        taskFactories.Add(new VersionJarDownloadTaskFactory(_descriptor));
+        
+        var networkTasks = new List<NetworkTask>();
+        for (int i = 0; i < taskFactories.Count; i++)
+        {
+            var nt = await taskFactories[i].CreateAsync(update);
+            if (nt != null)
+            {
+                networkTasks.Add(nt);
+                networkTaskCreatedCallback.Invoke(nt);
+            }
+        }
+
+        foreach (var nt in networkTasks)
+        {
+            await nt.StartAsync();
+        }
+        
+        // create log4j config file
+        if (!File.Exists(GetLog4jConfigFilePath()))
+        {
+            await using var res = EmbeddedResources.GetResourceStream(
+                $"Mlaumcherb.Client.Avalonia.встроенное.{GetLog4jConfigFileName()}");
+            await using var file = File.OpenWrite(GetLog4jConfigFilePath());
+            await res.CopyToAsync(file);
+        }
+        
+        _props.IsInstalled = true;
+        LauncherApp.Logger.LogInfo(Id, $"finished updating version {Id}");
+    }
+    
+    //minecraft player uuid explanation
+    //https://gist.github.com/CatDany/0e71ca7cd9b42a254e49/
+    //java uuid generation in c#
+    //https://stackoverflow.com/questions/18021808/uuid-interop-with-c-sharp-code
+    public static string GetPlayerUUID(string name)
+    {
+        byte[] name_bytes = Encoding.UTF8.GetBytes("OfflinePlayer:" + name);
+        var md5 = MD5.Create();
+        byte[] hash = md5.ComputeHash(name_bytes);
+        hash[6] &= 0x0f;
+        hash[6] |= 0x30;
+        hash[8] &= 0x3f;
+        hash[8] |= 0x80;
+        
+        StringBuilder sb = new StringBuilder();
+        for (int i = 0; i < hash.Length; i++)
+            sb.Append(hash[i].ToString("x2"));
+        sb.Insert(8, '-').Insert(13, '-').Insert(18, '-').Insert(23, '-');
+        return sb.ToString();
+    }
+
+    public async Task Launch()
+    {
+        if (string.IsNullOrWhiteSpace(LauncherApp.Config.player_name))
+            throw new Exception("invalid player name");
+        
+        Directory.Create(WorkingDirectory);
+        string uuid = GetPlayerUUID(LauncherApp.Config.player_name);
+        Dictionary<string, string> placeholder_values = new() {
+            { "resolution_width", "1600" },
+            { "resolution_height", "900" },
+            { "xms", LauncherApp.Config.max_memory.ToString() },
+            { "xmx", LauncherApp.Config.max_memory.ToString() },
+            { "auth_player_name", LauncherApp.Config.player_name },
+            { "auth_access_token", uuid },
+            { "auth_session", $"token:{uuid}:{uuid}" },
+            { "auth_xuid", "" },
+            { "auth_uuid", uuid },
+            { "clientid", "" },
+            { "user_properties", "{}" },
+            { "user_type", "userType" },
+            { "launcher_name", "java-minecraft-launcher" },
+            { "launcher_version", "1.6.84-j" },
+            { "classpath", _libraries.Libs.Select(l => l.jarFilePath)
+                .Append(GetVersionJarFilePath(_descriptor.id))
+                .MergeToString(';') },
+            { "assets_index_name", _descriptor.assets },
+            { "assets_root", GetAssetsDir().ToString() },
+            { "game_assets", GetAssetsDir().ToString() },
+            { "game_directory", WorkingDirectory.ToString() },
+            { "natives_directory", GetNativeLibrariesDir(_descriptor.id).ToString() },
+            { "library_directory", GetLibrariesDir().ToString() },
+            { "classpath_separator", ";"},
+            { "path", GetLog4jConfigFilePath().ToString() },
+            { "version_name", _descriptor.id },
+            { "version_type", _descriptor.type },
+            { "arch", PlatformHelper.GetArchOld() },
+            // { "quickPlayMultiplayer", "" },
+            // { "quickPlayPath", "" },
+            // { "quickPlayRealms", "" },
+            // { "quickPlaySingleplayer", "" },
+            { "client_jar", GetVersionJarFilePath(_descriptor.id).ToString() },
+        };
+        
+        List<string> argsList = new();
+        argsList.AddRange(_javaArgs.FillPlaceholders(placeholder_values));
+        argsList.Add(_descriptor.mainClass);
+        argsList.AddRange(_gameArgs.FillPlaceholders(placeholder_values));
+        var command = Cli.Wrap(JavaExecutableFilePath.ToString())
+            .WithWorkingDirectory(WorkingDirectory.ToString())
+            .WithArguments(argsList)
+            .WithValidation(CommandResultValidation.None);
+        if (LauncherApp.Config.redirect_game_output)
+        {
+            command = command
+                .WithStandardOutputPipe(PipeTarget.ToDelegate(LogGameOut))
+                .WithStandardErrorPipe(PipeTarget.ToDelegate(LogGameError));
+        }
+        LauncherApp.Logger.LogInfo(Id, "launching the game");
+        LauncherApp.Logger.LogDebug(Id, "java: " + command.TargetFilePath);
+        LauncherApp.Logger.LogDebug(Id, "working_dir: " + command.WorkingDirPath);
+        LauncherApp.Logger.LogDebug(Id, "arguments: \n\t" + argsList.MergeToString("\n\t"));
+        _gameCts = new();
+        _commandTask = command.ExecuteAsync(_gameCts.Token);
+        var result = await _commandTask;
+        LauncherApp.Logger.LogInfo(Id, $"game exited with code {result.ExitCode}");
+    }
+
+    private void LogGameOut(string line)
+    {
+        LauncherApp.Logger.LogInfo(Id, line);
+    }
+    private void LogGameError(string line)
+    {
+        LauncherApp.Logger.LogWarn(Id, line);
+    }
+    
+    public void Close()
+    {
+        _gameCts?.Cancel();
+    }
+
+
+    public override string ToString() => Id;
+}

Mlaumcherb.Client.Avalonia/LauncherLogger.cs

@@ -0,0 +1,82 @@
+namespace Mlaumcherb.Client.Avalonia;
+
+public class LauncherLogger : ILogger
+{
+    private CompositeLogger _compositeLogger;
+    private FileLogger _fileLogger;
+    public static readonly IOPath LogsDirectory = "launcher_logs";
+    public IOPath LogfileName => _fileLogger.LogfileName;
+    
+    public LauncherLogger()
+    {
+        _fileLogger = new FileLogger(LogsDirectory, "млаумчерб");
+        _fileLogger.DebugLogEnabled = true;
+        ILogger[] loggers = 
+        [
+            _fileLogger,
+#if DEBUG
+            new ConsoleLogger(),
+#endif
+        ];
+        _compositeLogger = new CompositeLogger(loggers);
+    }
+
+    public record LogMessage(string context, LogSeverity severity, object message, ILogFormat format);
+
+    public delegate void LogHandler(LogMessage msg);
+    public event LogHandler? OnLogMessage;
+    
+    public void Log(string context, LogSeverity severity, object message, ILogFormat format)
+    {
+        _compositeLogger.Log(context, severity, message, format);
+        bool isEnabled = severity switch
+        {
+            LogSeverity.Debug => DebugLogEnabled,
+            LogSeverity.Info => InfoLogEnabled,
+            LogSeverity.Warn => WarnLogEnabled,
+            LogSeverity.Error => ErrorLogEnabled,
+            _ => throw new ArgumentOutOfRangeException(nameof(severity), severity, null)
+        };
+        if(isEnabled)
+            OnLogMessage?.Invoke(new(context, severity, message, format));
+    }
+    
+    public void Dispose()
+    {
+        _compositeLogger.Dispose();
+    }
+
+    public ILogFormat Format
+    {
+        get => _compositeLogger.Format;
+        set => _compositeLogger.Format = value;
+    }
+
+    public bool DebugLogEnabled
+    {
+        get => _compositeLogger.DebugLogEnabled;
+        set
+        {
+            _compositeLogger.DebugLogEnabled = value;
+            _fileLogger.DebugLogEnabled = true;
+        }
+    }
+
+    public bool InfoLogEnabled
+    {
+        get => _compositeLogger.InfoLogEnabled;
+        set => _compositeLogger.InfoLogEnabled = value;
+    }
+
+    public bool WarnLogEnabled
+    {
+        get => _compositeLogger.WarnLogEnabled;
+        set => _compositeLogger.WarnLogEnabled = value;
+    }
+
+    public bool ErrorLogEnabled
+    {
+        get => _compositeLogger.ErrorLogEnabled;
+        set => _compositeLogger.ErrorLogEnabled = value;
+    }
+}

Mlaumcherb.Client.Avalonia/Mlaumcherb.Client.Avalonia.csproj

@@ -1,6 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
-        <OutputType>WinExe</OutputType>
+        <OutputType Condition="'$(Configuration)' == 'Debug'">Exe</OutputType>
+        <OutputType Condition="'$(Configuration)' != 'Debug'">WinExe</OutputType>
         <TargetFramework>net8.0</TargetFramework>
         <LangVersion>latest</LangVersion>
         <Nullable>enable</Nullable>
@@ -10,24 +11,28 @@
         <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
         <ApplicationIcon>капитал\кубе.ico</ApplicationIcon>
         <AssemblyName>млаумчерб</AssemblyName>
+        <Configurations>Release;Debug</Configurations>
+        <Platforms>x64</Platforms>
+        <!-- AXAML resource has no public constructor -->
+        <NoWarn>AVLN3001</NoWarn>
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Avalonia" Version="11.*" />
-        <PackageReference Include="Avalonia.Desktop" Version="11.*" />
-        <PackageReference Include="Avalonia.Themes.Simple" Version="11.*" />
-        <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="11.*" />
-        <PackageReference Include="AvaloniaGif-Unofficial" Version="1.0.0" />
-        <PackageReference Include="DTLib" Version="1.3.*" />
-        <PackageReference Include="DTLib.Ben.Demystifier" Version="1.0.*" />
-        <PackageReference Include="DTLib.Logging" Version="1.3.*" />
-        <PackageReference Include="DTLib.Network" Version="1.4.*" />
-        <PackageReference Include="MessageBox.Avalonia" Version="3.1.*" />
+        <PackageReference Include="Avalonia" Version="11.2.0" />
+        <PackageReference Include="Avalonia.Desktop" Version="11.2.0" />
+        <PackageReference Include="Avalonia.Themes.Simple" Version="11.2.0" />
+        <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="11.2.0" />
+        <PackageReference Include="Avalonia.Labs.Gif" Version="11.2.0" />
+        <PackageReference Include="CliWrap" Version="3.6.7" />
+        <PackageReference Include="DTLib" Version="1.6.1" />
+        <PackageReference Include="LZMA-SDK" Version="22.1.1" />
+        <PackageReference Include="MessageBox.Avalonia" Version="3.2.0" />
         <PackageReference Include="Newtonsoft.Json" Version="13.*" />
     </ItemGroup>
 
     <ItemGroup>
         <AvaloniaResource Include="капитал\**"/>
+        <EmbeddedResource Include="встроенное\**" />
     </ItemGroup>
-
+    
 </Project>

Mlaumcherb.Client.Avalonia/Program.cs

@@ -0,0 +1,43 @@
+global using System;
+global using System.Collections;
+global using System.Collections.Generic;
+global using System.IO;
+global using System.Text;
+global using System.Threading;
+global using System.Threading.Tasks;
+global using Newtonsoft.Json;
+global using DTLib;
+global using DTLib.Logging;
+global using DTLib.Filesystem;
+global using File = DTLib.Filesystem.File;
+global using Directory = DTLib.Filesystem.Directory;
+global using Path = DTLib.Filesystem.Path;
+using System.Globalization;
+using Avalonia;
+using Mlaumcherb.Client.Avalonia.зримое;
+
+namespace Mlaumcherb.Client.Avalonia;
+
+public class Program
+{
+    [STAThread]
+    public static void Main(string[] args)
+    {
+        try
+        {
+            CultureInfo.DefaultThreadCurrentCulture = CultureInfo.InvariantCulture;
+            BuildAvaloniaApp()
+                .StartWithClassicDesktopLifetime(args);
+        }
+        catch (Exception ex)
+        {
+            LauncherApp.Logger.LogError(nameof(Program), ex);
+        }
+    }
+
+    // Avalonia configuration, don't remove; also used by visual designer.
+    public static AppBuilder BuildAvaloniaApp()
+        => AppBuilder.Configure<LauncherApp>()
+            .UsePlatformDetect()
+            .LogToTrace();
+}

Mlaumcherb.Client.Avalonia/встроенное/log4j.xml

@@ -0,0 +1,28 @@
+<Configuration status="WARN" packages="com.mojang.util">
+    <Appenders>
+        <Console name="SysOut" target="SYSTEM_OUT">
+            <PatternLayout pattern="[%d{HH:mm:ss}] [%t/%level]: %msg%n"/>
+        </Console>
+        <Queue name="ServerGuiConsole">
+            <PatternLayout pattern="[%d{HH:mm:ss} %level]: %msg%n"/>
+        </Queue>
+        <RollingRandomAccessFile name="File" fileName="logs/latest.log" filePattern="logs/%d{yyyy-MM-dd}-%i.log.gz">
+            <PatternLayout pattern="[%d{HH:mm:ss}] [%t/%level]: %msg%n"/>
+            <Policies>
+                <TimeBasedTriggeringPolicy/>
+                <OnStartupTriggeringPolicy/>
+            </Policies>
+        </RollingRandomAccessFile>
+    </Appenders>
+    <Loggers>
+        <Root level="info">
+            <filters>
+                <MarkerFilter marker="NETWORK_PACKETS" onMatch="DENY" onMismatch="NEUTRAL"/>
+                <RegexFilter regex="(?s).*\$\{[^}]*\}.*" onMatch="DENY" onMismatch="NEUTRAL"/>
+            </filters>
+            <AppenderRef ref="SysOut"/>
+            <AppenderRef ref="File"/>
+            <AppenderRef ref="ServerGuiConsole"/>
+        </Root>
+    </Loggers>
+</Configuration>

Mlaumcherb.Client.Avalonia/зримое/DownloadItemView.axaml

@@ -0,0 +1,26 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="Mlaumcherb.Client.Avalonia.зримое.NetworkTaskView"
+             Padding="4" MinHeight="90" MinWidth="200"
+             VerticalAlignment="Top"
+             HorizontalAlignment="Stretch"
+             BorderThickness="1" BorderBrush="#999999">
+    <Grid RowDefinitions="* * *" ColumnDefinitions="* 30">
+        <TextBlock Name="NameText" 
+                   Grid.Row="0" Grid.Column="0" />
+        <Button Grid.Row="0" Grid.Column="1"
+                Classes="button_no_border"
+                Background="Transparent"
+                Foreground="#FF4040"
+                FontSize="12"
+                Click="RemoveFromList">
+            [X]
+        </Button>
+        <TextBlock Name="StatusText"
+            Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="2" 
+            FontSize="15"/>
+        <TextBlock Name="ProgressText"
+                   Grid.Row="2" Grid.Column="0" Grid.ColumnSpan="2" 
+                   FontSize="14"/>
+    </Grid>
+</UserControl>

Mlaumcherb.Client.Avalonia/зримое/DownloadItemView.axaml.cs

@@ -0,0 +1,66 @@
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Threading;
+using Mlaumcherb.Client.Avalonia.сеть;
+
+namespace Mlaumcherb.Client.Avalonia.зримое;
+
+public partial class NetworkTaskView : UserControl
+{
+    public readonly NetworkTask Task;
+    private readonly Action<NetworkTaskView> _removeFromList;
+
+
+    public NetworkTaskView()
+    {
+        throw new Exception();
+    }
+    
+    public NetworkTaskView(NetworkTask task, Action<NetworkTaskView> removeFromList)
+    {
+        Task = task;
+        _removeFromList = removeFromList;
+        InitializeComponent();
+        NameText.Text = task.Name;
+        StatusText.Text = task.DownloadStatus.ToString();
+        task.OnStart += OnTaskOnStart;
+        task.OnProgress += ReportProgress;
+        task.OnStop += OnTaskStop;
+    }
+
+    private void OnTaskOnStart()
+    {
+        Dispatcher.UIThread.Invoke(() =>
+        {
+            StatusText.Text = Task.DownloadStatus.ToString();
+        });
+    }
+
+    private void OnTaskStop(NetworkTask.Status status)
+    {
+        Dispatcher.UIThread.Invoke(() =>
+        {
+            StatusText.Text = status.ToString();
+            if(!string.IsNullOrEmpty(ProgressText.Text))
+            {
+                int speedIndex = ProgressText.Text.IndexOf('(');
+                if(speedIndex > 0)
+                    ProgressText.Text = ProgressText.Text.Remove(speedIndex);
+            }
+        });
+    }
+
+    void ReportProgress(DownloadProgress progress)
+    {
+        Dispatcher.UIThread.Invoke(() =>
+        {
+            ProgressText.Text = progress.ToString();
+        });
+    }
+
+    private void RemoveFromList(object? sender, RoutedEventArgs e)
+    {
+        Task.Cancel();
+        Dispatcher.UIThread.Invoke(() => _removeFromList.Invoke(this));
+    }
+}

Mlaumcherb.Client.Avalonia/зримое/GameVersionItemView.axaml

@@ -0,0 +1,10 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:local="clr-namespace:Mlaumcherb.Client.Avalonia"
+             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+             x:Class="Mlaumcherb.Client.Avalonia.зримое.GameVersionItemView"
+             Padding="2">
+    <TextBlock Name="text" Background="Transparent"/>
+</UserControl>

Mlaumcherb.Client.Avalonia/зримое/GameVersionItemView.axaml.cs

@@ -0,0 +1,48 @@
+using Avalonia.Controls;
+using Avalonia.Media;
+using Avalonia.Threading;
+using Mlaumcherb.Client.Avalonia.классы;
+
+namespace Mlaumcherb.Client.Avalonia.зримое;
+
+public abstract partial class GameVersionItemView : ListBoxItem
+{
+    private static readonly SolidColorBrush _avaliableColor = new(Color.FromRgb(30, 130, 40));
+    private static readonly SolidColorBrush _unavaliableColor = new(Color.FromRgb(170, 70, 70));
+
+    protected GameVersionItemView(string name, bool initialStatus)
+    {
+        InitializeComponent();
+        text.Text = name;
+        UpdateBackground(initialStatus);
+    }
+
+    protected void UpdateBackground(bool isInstalled)
+    {
+        Dispatcher.UIThread.Invoke(() => Background = isInstalled ? _avaliableColor : _unavaliableColor);
+    }
+}
+
+// Background changes when props status changes
+public class InstalledGameVersionItemView : GameVersionItemView
+{
+    public readonly InstalledGameVersionProps Props;
+    
+    public InstalledGameVersionItemView(InstalledGameVersionProps props) : base(props.Id, props.IsInstalled)
+    {
+        Props = props;
+        props.StatusChanged += UpdateBackground;
+    }
+}
+
+// Background is set once by checking if the version is present in InstalledVersionsCatalog
+public class RemoteGameVersionItemView : GameVersionItemView
+{
+    public readonly RemoteVersionDescriptorProps Props;
+    
+    public RemoteGameVersionItemView(RemoteVersionDescriptorProps props) 
+        : base(props.id, LauncherApp.InstalledVersionCatalog.versions.ContainsKey(props.id))
+    {
+        Props = props;
+    }
+}

Mlaumcherb.Client.Avalonia/зримое/LauncherApp.axaml

@@ -0,0 +1,63 @@
+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="Mlaumcherb.Client.Avalonia.зримое.LauncherApp"
+             RequestedThemeVariant="Dark">
+    <Application.Styles>
+        <SimpleTheme />
+        
+        <Style Selector="Border.dark_tr_bg">
+            <Setter Property="Background" Value="#cc232333"/>
+        </Style>
+        
+        <Style Selector="Border.white_border">
+            <Setter Property="BorderThickness" Value="1"/>
+            <Setter Property="BorderBrush" Value="White"/>
+        </Style>
+        
+        <Style Selector="Button.button_no_border">
+            <Setter Property="BorderThickness" Value="1"/>
+            <Setter Property="BorderBrush" Value="Transparent"/>
+        </Style>
+        
+        <Style Selector="Button.menu_button">
+            <Setter Property="Background" Value="Transparent"/>
+            <Setter Property="Padding" Value="4 0"/>
+            <Setter Property="MinWidth" Value="50"/>
+        </Style>
+        
+        <Style Selector="Button.button_dark">
+            <Setter Property="Background" Value="#65656070"/>
+        </Style>
+        
+        <Style Selector="Border.menu_separator">
+            <Setter Property="Background" Value="#ff505050"/>
+            <Setter Property="Width" Value="1"/>
+            <Setter Property="Margin" Value="4"/>
+        </Style>
+        
+        <Style Selector="ScrollBar /template/ Border">
+            <Setter Property="Width" Value="5"/>
+            <Setter Property="Margin" Value="4"/>
+            <Setter Property="ClipToBounds" Value="True"/>
+            <Setter Property="CornerRadius" Value="0"/>
+        </Style>
+        <Style Selector="ScrollBar /template/ Rectangle">
+            <Setter Property="Fill" Value="#d8ceb9"/>
+        </Style>
+        <Style Selector="ScrollBar /template/ Thumb">
+            <Setter Property="Background" Value="#fd7300"/>
+            <Setter Property="Cursor" Value="Hand"/>
+            <Setter Property="CornerRadius" Value="0"/>
+        </Style>
+        <Style Selector="ScrollBar /template/ Thumb /template/ Border">
+            <Setter Property="ClipToBounds" Value="True"/>
+            <Setter Property="CornerRadius" Value="0"/>
+            <Setter Property="Width" Value="5"/>
+        </Style>
+        
+    </Application.Styles>
+    
+    <Application.Resources>
+        <FontFamily x:Key="MonospaceFont">avares://млаумчерб/капитал/IBMPlexMono-Regular.ttf</FontFamily>
+    </Application.Resources>
+</Application>

Mlaumcherb.Client.Avalonia/зримое/LauncherApp.axaml.cs

@@ -0,0 +1,39 @@
+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+using Mlaumcherb.Client.Avalonia.классы;
+
+namespace Mlaumcherb.Client.Avalonia.зримое;
+
+public class LauncherApp : Application
+{
+    public static LauncherLogger Logger = new();
+    public static Config Config = null!;
+    public static InstalledVersionCatalog InstalledVersionCatalog = null!;
+    
+    public override void Initialize()
+    {
+        Logger.LogInfo(nameof(LauncherApp), "приложение запущено");
+        Config = Config.LoadFromFile();
+        Logger.DebugLogEnabled = Config.debug;
+        AvaloniaXamlLoader.Load(this);
+        
+        // some file required by forge installer
+        if (!File.Exists("launcher_profiles.json"))
+        {
+            File.WriteAllText("launcher_profiles.json", "{}");
+        }
+
+        InstalledVersionCatalog = InstalledVersionCatalog.Load();
+    }
+
+    public override void OnFrameworkInitializationCompleted()
+    {
+        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            desktop.MainWindow = new MainWindow();
+        }
+
+        base.OnFrameworkInitializationCompleted();
+    }
+}

Mlaumcherb.Client.Avalonia/зримое/LogMessageView.axaml

@@ -0,0 +1,13 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+             x:Class="Mlaumcherb.Client.Avalonia.зримое.LogMessageView"
+             FontSize="14">
+    <SelectableTextBlock Name="ContentTextBox"
+                         FontSize="{Binding $parent.FontSize}"
+                         TextWrapping="Wrap"
+                         VerticalAlignment="Top"
+                         Background="Transparent"/>
+</UserControl>

Mlaumcherb.Client.Avalonia/зримое/LogMessageView.axaml.cs

@@ -0,0 +1,23 @@
+using Avalonia.Controls;
+
+namespace Mlaumcherb.Client.Avalonia.зримое;
+
+public partial class LogMessageView : UserControl
+{
+    public static ILogFormat ShortLogFormat = new DefaultLogFormat
+    {
+        TimeStampFormat = MyTimeFormat.TimeOnly,
+        PrintContext = false
+    }; 
+    
+    public LogMessageView()
+    {
+        throw new Exception();
+    }
+
+    public LogMessageView(LauncherLogger.LogMessage m)
+    {
+        InitializeComponent();
+        ContentTextBox.Text = ShortLogFormat.CreateMessage(m.context, m.severity, m.message);
+    }
+}

Mlaumcherb.Client.Avalonia/зримое/MainWindow.axaml

@@ -0,0 +1,189 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:gif="clr-namespace:Avalonia.Labs.Gif;assembly=Avalonia.Labs.Gif"
+        xmlns:local="clr-namespace:Mlaumcherb.Client.Avalonia"
+        x:Class="Mlaumcherb.Client.Avalonia.зримое.MainWindow"
+        Name="window"
+        Title="млаумчерб"
+        Icon="avares://млаумчерб/капитал/кубе.ico"
+        FontFamily="{StaticResource MonospaceFont}" FontSize="18"
+        MinWidth="800" MinHeight="400"
+        Width="800" Height="600"
+        WindowStartupLocation="CenterScreen">
+    <Grid RowDefinitions="* 30">
+        <Image Grid.RowSpan="2" Stretch="UniformToFill"
+               Source="avares://млаумчерб/капитал/фоне.png"/>
+        
+        <Grid Grid.Row="0" Margin="10">
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition MinWidth="150"/>
+                <ColumnDefinition Width="2" />
+                <ColumnDefinition MinWidth="300"/>
+                <ColumnDefinition Width="2" />
+                <ColumnDefinition MinWidth="150"/>
+            </Grid.ColumnDefinitions>
+            
+            <GridSplitter Grid.Column="1" Background="Transparent" ResizeDirection="Columns" />
+            <GridSplitter Grid.Column="3" Background="Transparent" ResizeDirection="Columns"/>
+            
+            <!-- Central panel -->
+            <Border Grid.Column="2"
+                    Classes="dark_tr_bg white_border">
+                <Grid>
+                    <Grid.RowDefinitions>* 60</Grid.RowDefinitions>
+                    <ScrollViewer Grid.Row="0" 
+                              HorizontalScrollBarVisibility="Disabled"
+                              VerticalScrollBarVisibility="Auto">
+                        <StackPanel Margin="10" Spacing="6">
+                            <TextBlock>Ник:</TextBlock>
+                            <TextBox Background="Transparent"
+                                     Text="{Binding #window.PlayerName}"/>
+                            
+                            <TextBlock>Версия игры:</TextBlock>
+                            <ComboBox Name="InstalledVersionCatalogComboBox"/>
+                            <Button Name="RescanInstalledVersionsButton" 
+                                    Click="RescanInstalledVersionsButton_OnClick"
+                                    Classes="button_dark">
+                                Обновить список
+                            </Button>
+                            <Button Name="DeleteVersionButton" 
+                                    Click="DeleteVersionButton_OnClick"
+                                    Classes="button_dark">
+                                Удалить версию
+                            </Button>
+                            
+                            <Expander Header="Добавление версий"
+                                      BorderThickness="1" BorderBrush="Gray"
+                                      Padding="4">
+                                <StackPanel Spacing="6">
+                                    <TextBlock>Источник:</TextBlock>
+                                    <ComboBox Name="RemoteVersionCatalogComboBox"/>
+                                    <WrapPanel>
+                                        <CheckBox Name="ReleaseVersionTypeCheckBox" IsChecked="True">релиз</CheckBox>
+                                        <CheckBox Name="SnapshotVersionTypeCheckBox">снапшот</CheckBox>
+                                        <CheckBox Name="OldVersionTypeCheckBox">старое</CheckBox>
+                                        <CheckBox Name="OtherVersionTypeAlphaCheckBox">другое</CheckBox>
+                                    </WrapPanel>
+                                    <Button Name="SearchVersionsButton"
+                                            Click="SearchVersionsButton_OnClick"
+                                            Classes="button_dark">
+                                        Поиск
+                                    </Button>
+                                    <TextBlock>Доступные версии:</TextBlock>
+                                    <ComboBox Name="RemoteVersionCatalogItemsComboBox"/>
+                                    <Button Name="AddVersionButton" IsEnabled="False"
+                                        Click="AddVersionButton_OnClick"
+                                        Classes="button_dark">
+                                        Добавить
+                                    </Button>
+                                </StackPanel>
+                            </Expander>
+                            
+                            <TextBlock>
+                                <Run>Выделенная память:</Run>
+                                <TextBox Background="Transparent" Padding="0"
+                                         BorderThickness="1"
+                                         BorderBrush="#777777"
+                                         Text="{Binding #window.MemoryLimit}">
+                                </TextBox>
+                                <Run>Мб</Run>
+                            </TextBlock>
+                            <Slider Minimum="2048" Maximum="8192"
+                                    Value="{Binding #window.MemoryLimit}">
+                            </Slider>
+                            
+                            <CheckBox IsChecked="{Binding #window.UpdateGameFiles}">
+                                Обновить файлы игры
+                            </CheckBox>
+                            <CheckBox IsChecked="{Binding #window.EnableJavaDownload}">
+                                Скачивать джаву
+                            </CheckBox>
+                            <CheckBox IsChecked="{Binding #window.RedirectGameOutput}">
+                                Выводить лог игры в лаунчер
+                            </CheckBox>
+                        </StackPanel>
+                    </ScrollViewer>
+                    <Button Name="LaunchButton" Grid.Row="1"
+                            Margin="10" Padding="4"
+                            Classes="button_no_border"
+                            Background="#BBfd7300"
+                            Click="Запуск">
+                        Запуск
+                    </Button>
+                </Grid>
+            </Border>
+            
+            <!-- Left panel -->
+            <Border Grid.Column="0"
+                    Classes="dark_tr_bg white_border">
+                <Grid RowDefinitions="36 *">
+                    <Border Classes="white_border" Margin="-1" Padding="4">
+                        <DockPanel>
+                            <TextBlock FontWeight="Bold"
+                                       DockPanel.Dock="Left">
+                                Лог
+                            </TextBlock>
+                            <Button Click="ClearLogPanel"
+                                    Classes="menu_button"
+                                    DockPanel.Dock="Right"
+                                    HorizontalAlignment="Right">
+                                очистить
+                            </Button>
+                        </DockPanel>
+                    </Border>
+                    <ScrollViewer Name="LogScrollViewer" Grid.Row="1" 
+                                  HorizontalScrollBarVisibility="Disabled"
+                                  VerticalScrollBarVisibility="Visible"
+                                  Background="Transparent">
+                        <StackPanel Name="LogPanel" 
+                                    VerticalAlignment="Top"/>
+                    </ScrollViewer>
+                </Grid>
+            </Border>
+            
+            <!-- Right panel -->
+            <Border Grid.Column="4"
+                    Classes="dark_tr_bg white_border">
+                <Grid RowDefinitions="36 *">
+                    <Border Classes="white_border" Margin="-1" Padding="4">
+                        <DockPanel>
+                            <TextBlock FontWeight="Bold"
+                                       DockPanel.Dock="Left">
+                                Загрузки
+                            </TextBlock>
+                            <Button Click="ClearDownloadsPanel"
+                                    Classes="menu_button"
+                                    DockPanel.Dock="Right"
+                                    HorizontalAlignment="Right">
+                                очистить
+                            </Button>
+                        </DockPanel>
+                    </Border>
+                    <ScrollViewer Grid.Row="1" 
+                                  HorizontalScrollBarVisibility="Disabled"
+                                  VerticalScrollBarVisibility="Visible"
+                                  Background="Transparent" 
+                                  Padding="1">
+                        <StackPanel Name="DownloadsPanel" 
+                                    VerticalAlignment="Top"/>    
+                    </ScrollViewer>
+                </Grid>
+            </Border>
+        </Grid>
+        <Border Grid.Row="1" Background="#954808B0">
+            <Grid>
+                <StackPanel Orientation="Horizontal" HorizontalAlignment="Left">
+                    <Button Classes="menu_button button_no_border" Click="ОткрытьПапкуЛаунчера">папка лаунчера</Button>
+                    <Border Classes="menu_separator"/>
+                    <Button Classes="menu_button button_no_border" Click="ОткрытьФайлЛогов">лог-файл</Button>
+                </StackPanel>
+                <StackPanel Orientation="Horizontal" HorizontalAlignment="Right">
+                    <Button Classes="menu_button button_no_border" Click="ОткрытьРепозиторий">исходный код</Button>
+                    <gif:GifImage 
+                        Width="30" Height="30" Stretch="Uniform"
+                        Source="avares://млаумчерб/капитал/лисик.gif"/>
+                </StackPanel>
+            </Grid>
+        </Border>
+    </Grid>
+</Window>

Mlaumcherb.Client.Avalonia/зримое/MainWindow.axaml.cs

@@ -0,0 +1,331 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Data;
+using Avalonia.Interactivity;
+using Avalonia.Platform.Storage;
+using Avalonia.Threading;
+using Mlaumcherb.Client.Avalonia.классы;
+using Mlaumcherb.Client.Avalonia.холопы;
+using MsBox.Avalonia;
+using MsBox.Avalonia.Dto;
+using MsBox.Avalonia.Models;
+
+namespace Mlaumcherb.Client.Avalonia.зримое;
+
+public partial class MainWindow : Window
+{
+    public static readonly StyledProperty<string> PlayerNameProperty =
+        AvaloniaProperty.Register<MainWindow, string>(nameof(PlayerName),
+            defaultBindingMode: BindingMode.TwoWay);
+    public string PlayerName
+    {
+        get => GetValue(PlayerNameProperty);
+        set => SetValue(PlayerNameProperty, value);
+    }
+    
+    public static readonly StyledProperty<int> MemoryLimitProperty =
+        AvaloniaProperty.Register<MainWindow, int>(nameof(MemoryLimit),
+            defaultBindingMode: BindingMode.TwoWay, defaultValue: 2048);
+    public int MemoryLimit
+    {
+        get => GetValue(MemoryLimitProperty);
+        set => SetValue(MemoryLimitProperty, value);
+    }
+    
+    public static readonly StyledProperty<bool> UpdateGameFilesProperty =
+        AvaloniaProperty.Register<MainWindow, bool>(nameof(UpdateGameFiles),
+            defaultBindingMode: BindingMode.TwoWay, defaultValue: false);
+    public bool UpdateGameFiles
+    {
+        get => GetValue(UpdateGameFilesProperty);
+        set => SetValue(UpdateGameFilesProperty, value);
+    }
+    
+    
+    public static readonly StyledProperty<bool> EnableJavaDownloadProperty =
+        AvaloniaProperty.Register<MainWindow, bool>(nameof(EnableJavaDownload),
+            defaultBindingMode: BindingMode.TwoWay, defaultValue: true);
+    public bool EnableJavaDownload
+    {
+        get => GetValue(EnableJavaDownloadProperty);
+        set => SetValue(EnableJavaDownloadProperty, value);
+    }
+    
+    public static readonly StyledProperty<bool> RedirectGameOutputProperty =
+        AvaloniaProperty.Register<MainWindow, bool>(nameof(RedirectGameOutput),
+            defaultBindingMode: BindingMode.TwoWay, defaultValue: false);
+    public bool RedirectGameOutput
+    {
+        get => GetValue(RedirectGameOutputProperty);
+        set => SetValue(RedirectGameOutputProperty, value);
+    }
+    
+    public MainWindow()
+    {
+        InitializeComponent();
+    }
+    
+    protected override void OnLoaded(RoutedEventArgs e)
+    {
+        try
+        {
+            LauncherApp.Logger.OnLogMessage += GuiLogMessage;
+
+            PlayerName = LauncherApp.Config.player_name;
+            MemoryLimit = LauncherApp.Config.max_memory;
+            EnableJavaDownload = LauncherApp.Config.download_java;
+            RedirectGameOutput = LauncherApp.Config.redirect_game_output;
+            
+            foreach (var vc in LauncherApp.Config.version_catalogs)
+            {
+                RemoteVersionCatalogComboBox.Items.Add(vc);
+            }
+            RemoteVersionCatalogComboBox.SelectedIndex = 0;
+            
+            UpdateInstalledVersionsCatalogView(LauncherApp.Config.last_launched_version);
+        }
+        catch (Exception ex)
+        {
+            ErrorHelper.ShowMessageBox(nameof(MainWindow), ex);
+        }
+    }
+
+    private void UpdateInstalledVersionsCatalogView(string? selectVersion)
+    {
+        LauncherApp.InstalledVersionCatalog.CheckInstalledVersions();
+        InstalledVersionCatalogComboBox.IsEnabled = false;
+        InstalledVersionCatalogComboBox.Items.Clear();
+        foreach (var p in LauncherApp.InstalledVersionCatalog.versions)
+        {
+            InstalledVersionCatalogComboBox.Items.Add(new InstalledGameVersionItemView(p.Value));
+        }
+        
+        InstalledVersionCatalogComboBox.SelectedItem = null;
+        if(selectVersion is not null 
+           && LauncherApp.InstalledVersionCatalog.versions.TryGetValue(selectVersion, out var props))
+        {
+            foreach (InstalledGameVersionItemView? view in InstalledVersionCatalogComboBox.Items)
+            {
+                if (view?.Props.Id == props.Id)
+                {
+                    InstalledVersionCatalogComboBox.SelectedItem = view;
+                    break;
+                }
+            }
+        }
+        
+        InstalledVersionCatalogComboBox.IsEnabled = true;
+    }
+
+    private void RescanInstalledVersionsButton_OnClick(object? sender, RoutedEventArgs e)
+    {
+        var selectedVersionView = InstalledVersionCatalogComboBox.SelectedItem as InstalledGameVersionItemView;
+        UpdateInstalledVersionsCatalogView(selectedVersionView?.Props.Id);
+    }
+    
+    private void GuiLogMessage(LauncherLogger.LogMessage msg)
+    {
+        if (msg.severity == LogSeverity.Debug) return;
+
+        Dispatcher.UIThread.Invoke(() =>
+        {
+            double offsetFromBottom = LogScrollViewer.Extent.Height - LogScrollViewer.Offset.Y - LogScrollViewer.Viewport.Height;
+            bool is_scrolled_to_end = offsetFromBottom < 20.0; // scrolled less then one line up 
+            LogPanel.Children.Add(new LogMessageView(msg));
+            if (is_scrolled_to_end) LogScrollViewer.ScrollToEnd();
+        });
+    }
+
+    private async void Запуск(object? sender, RoutedEventArgs e)
+    {
+        try
+        {
+            if (InstalledVersionCatalogComboBox.SelectedItem is not InstalledGameVersionItemView selectedVersionView) 
+                return;
+            
+            Dispatcher.UIThread.Invoke(() => LaunchButton.IsEnabled = false);
+            LauncherApp.Config.last_launched_version = selectedVersionView.Props.Id;
+            LauncherApp.Config.player_name = PlayerName;
+            LauncherApp.Config.max_memory = MemoryLimit;
+            LauncherApp.Config.download_java = EnableJavaDownload;
+            LauncherApp.Config.redirect_game_output = RedirectGameOutput;
+            LauncherApp.Config.SaveToFile();
+            
+            var v = await selectedVersionView.Props.LoadDescriptor(UpdateGameFiles);
+            await v.Download(UpdateGameFiles, nt =>
+                {
+                    Dispatcher.UIThread.Invoke(() =>
+                    {
+                        DownloadsPanel.Children.Add(new NetworkTaskView(nt,
+                            ntv => DownloadsPanel.Children.Remove(ntv)));
+                    });
+                }
+            );
+            Dispatcher.UIThread.Invoke(() =>
+            {
+                UpdateGameFiles = false;
+            });
+            await v.Launch();
+        }
+        catch (Exception ex)
+        {
+            ErrorHelper.ShowMessageBox(nameof(MainWindow), ex);
+        }
+        finally
+        {
+            Dispatcher.UIThread.Invoke(() => LaunchButton.IsEnabled = true);
+        }
+    }
+
+    private void ОткрытьПапкуЛаунчера(object? s, RoutedEventArgs e)
+    {
+        try
+        {
+            Launcher.LaunchDirectoryInfoAsync(new DirectoryInfo(Directory.GetCurrent().ToString()))
+                .ConfigureAwait(false);
+        }
+        catch (Exception ex)
+        {
+            ErrorHelper.ShowMessageBox(nameof(MainWindow), ex);
+        }
+    }
+    
+    private void ОткрытьФайлЛогов(object? sender, RoutedEventArgs e)
+    {
+        try
+        {
+            Launcher.LaunchFileInfoAsync(new FileInfo(LauncherApp.Logger.LogfileName.ToString()))
+                .ConfigureAwait(false);
+        }
+        catch (Exception ex)
+        {
+            ErrorHelper.ShowMessageBox(nameof(MainWindow), ex);
+        }
+    }
+
+    private void ОткрытьРепозиторий(object? sender, RoutedEventArgs e)
+    {
+        try
+        {
+            Launcher.LaunchUriAsync(new Uri("https://timerix.ddns.net:3322/Timerix/mlaumcherb"))
+                .ConfigureAwait(false);
+        }
+        catch (Exception ex)
+        {
+            ErrorHelper.ShowMessageBox(nameof(MainWindow), ex);
+        }
+    }
+
+    private void ClearLogPanel(object? sender, RoutedEventArgs e)
+    {
+        LogPanel.Children.Clear();
+    }
+    
+    
+    private void ClearDownloadsPanel(object? sender, RoutedEventArgs e)
+    {
+        foreach (var control in DownloadsPanel.Children)
+        {
+            var nt = (NetworkTaskView)control;
+            nt.Task.Cancel();
+        }
+        DownloadsPanel.Children.Clear();
+    }
+    
+    private async void SearchVersionsButton_OnClick(object? sender, RoutedEventArgs e)
+    {
+        try 
+        {
+            if(RemoteVersionCatalogComboBox.SelectedItem is not GameVersionCatalogProps catalogProps)
+                return;
+
+            var catalog = await catalogProps.GetVersionCatalogAsync();
+            var searchParams = new VersionSearchParams
+            {
+                ReleaseTypeAllowed = ReleaseVersionTypeCheckBox.IsChecked ?? false,
+                SnapshotTypeAllowed = SnapshotVersionTypeCheckBox.IsChecked ?? false,
+                OldTypeAllowed = OldVersionTypeCheckBox.IsChecked ?? false,
+                OtherTypeAllowed = OtherVersionTypeAlphaCheckBox.IsChecked ?? false
+            };
+            var versions = catalog.GetDownloadableVersions(searchParams);
+            
+            Dispatcher.UIThread.Invoke(() =>
+            {
+                RemoteVersionCatalogItemsComboBox.IsEnabled = false;
+                RemoteVersionCatalogItemsComboBox.Items.Clear();
+                foreach (var p in versions)
+                {
+                    RemoteVersionCatalogItemsComboBox.Items.Add(new RemoteGameVersionItemView(p));
+                }
+                RemoteVersionCatalogItemsComboBox.IsEnabled = true;
+                AddVersionButton.IsEnabled = versions.Count > 0;
+            });
+        }
+        catch (Exception ex)
+        {
+           ErrorHelper.ShowMessageBox(nameof(MainWindow), ex);
+        }
+    }
+
+    private void AddVersionButton_OnClick(object? sender, RoutedEventArgs e)
+    {
+        try
+        {
+            if(RemoteVersionCatalogComboBox.SelectedItem is not GameVersionCatalogProps catalogProps)
+                return;
+            
+            if(RemoteVersionCatalogItemsComboBox.SelectedItem is not RemoteGameVersionItemView sel)
+                return;
+            
+            var installedProps = new InstalledGameVersionProps(sel.Props.id, catalogProps, sel.Props);
+            if (!LauncherApp.InstalledVersionCatalog.versions.TryAdd(sel.Props.id, installedProps))
+                throw new Exception("Версия уже была добавлена");
+            LauncherApp.InstalledVersionCatalog.Save();
+            
+            var propsView = new InstalledGameVersionItemView(installedProps);
+            InstalledVersionCatalogComboBox.Items.Insert(0, propsView);
+            InstalledVersionCatalogComboBox.SelectedItem = propsView;
+        }
+        catch (Exception ex)
+        {
+            ErrorHelper.ShowMessageBox(nameof(MainWindow), ex);
+        }
+    }
+
+    private async void DeleteVersionButton_OnClick(object? sender, RoutedEventArgs e)
+    {
+        try
+        {
+            if(InstalledVersionCatalogComboBox.SelectedItem is not InstalledGameVersionItemView sel)
+                return;
+        
+            var box = MessageBoxManager.GetMessageBoxCustom(new MessageBoxCustomParams
+                {
+                    ButtonDefinitions = new List<ButtonDefinition> { new() { Name = "Да" }, new() { Name = "Нет" } },
+                    ContentTitle = $"Удаление версии {sel.Props.Id}",
+                    ContentMessage = $"Вы уверены, что хотите удалить версию {sel.Props.Id}? Все файлы, включая сохранения, будут удалены!",
+                    Icon = MsBox.Avalonia.Enums.Icon.Question,
+                    WindowStartupLocation = WindowStartupLocation.CenterOwner,
+                    SizeToContent = SizeToContent.WidthAndHeight,
+                    ShowInCenter = true,
+                    Topmost = true
+                }
+            );
+            var result = await box.ShowAsync().ConfigureAwait(false);
+            if (result != "Да") 
+                return;
+            
+            sel.Props.Delete();
+            Dispatcher.UIThread.Invoke(() =>
+            {
+                InstalledVersionCatalogComboBox.Items.Remove(sel);
+                LauncherApp.InstalledVersionCatalog.versions.Remove(sel.Props.Id);
+                LauncherApp.InstalledVersionCatalog.Save();
+            });
+        }
+        catch (Exception ex)
+        {
+            ErrorHelper.ShowMessageBox(nameof(MainWindow), ex);
+        }
+    }
+}

Mlaumcherb.Client.Avalonia/классы/Буржуазия/GameVersionCatalog.cs

@@ -0,0 +1,54 @@
+namespace Mlaumcherb.Client.Avalonia.классы;
+
+public record VersionSearchParams
+{
+    public bool ReleaseTypeAllowed;
+    public bool SnapshotTypeAllowed;
+    public bool OldTypeAllowed;
+    public bool OtherTypeAllowed;
+}
+
+public class GameVersionCatalog
+{ 
+    [JsonRequired] public List<RemoteVersionDescriptorProps> versions { get; set; } = new();
+    
+    /// <returns>empty list if couldn't find any remote versions</returns>
+    public List<RemoteVersionDescriptorProps> GetDownloadableVersions(VersionSearchParams p)
+    {
+        var _versionPropsList = new List<RemoteVersionDescriptorProps>();
+        foreach (var r in versions)
+        {
+            bool match = r.type switch
+            {
+                "release" => p.ReleaseTypeAllowed,
+                "snapshot" => p.SnapshotTypeAllowed,
+                "old_alpha" or "old_beta" => p.OldTypeAllowed,
+                _ => p.OtherTypeAllowed
+            };
+            if(match)
+                _versionPropsList.Add(r);
+        }
+        return _versionPropsList;
+    }
+}
+
+public class AssetProperties
+{
+    [JsonRequired] public string hash { get; set; } = "";
+    [JsonRequired] public int size { get; set; }
+}
+
+public class AssetIndex
+{
+    [JsonRequired] public Dictionary<string, AssetProperties> objects { get; set; } = new();
+}
+
+public class RemoteVersionDescriptorProps
+{
+    [JsonRequired] public string id { get; set; } = "";
+    [JsonRequired] public string url { get; set; } = "";
+    [JsonRequired] public string type { get; set; } = "";
+    public string sha1 { get; set; } = "";
+    public DateTime time { get; set; }
+    public DateTime releaseTime { get; set; }
+}

Mlaumcherb.Client.Avalonia/классы/Буржуазия/GameVersionDescriptor.cs

@@ -0,0 +1,118 @@
+using System.Linq;
+// ReSharper disable CollectionNeverUpdated.Global
+
+namespace Mlaumcherb.Client.Avalonia.классы;
+
+public class GameVersionDescriptor
+{
+    [JsonRequired] public string id { get; set; } = "";
+    [JsonRequired] public DateTime time { get; set; }
+    [JsonRequired] public DateTime releaseTime { get; set; }
+    [JsonRequired] public string type { get; set; } = "";
+    [JsonRequired] public string mainClass { get; set; } = "";
+    [JsonRequired] public List<Library> libraries { get; set; } = new();
+    [JsonRequired] public AssetIndexProperties assetIndex { get; set; } = null!;
+    [JsonRequired] public string assets { get; set; } = "";
+    public Downloads? downloads { get; set; } = null;
+    public JavaVersion javaVersion { get; set; } = new() { component = "jre-legacy", majorVersion = 8 };
+    public string? minecraftArguments { get; set; }
+    public ArgumentsNew? arguments { get; set; }
+    
+    // my additions
+    public MyModpackRemoteProps? modpack { get; set; }
+}
+
+public class Artifact
+{
+    public string? path = null;
+    [JsonRequired] public string url { get; set; } = "";
+    [JsonRequired] public string sha1 { get; set; } = "";
+    [JsonRequired] public int size { get; set; }
+}
+
+public class Os
+{
+    public string? name { get; set; }
+    public string? arch { get; set; }
+}
+
+public class Rule
+{
+    [JsonRequired] public string action { get; set; } = "";
+    public Os? os { get; set; }
+    public Dictionary<string, bool>? features { get; set; }
+}
+
+public class LibraryDownloads
+{
+    public Artifact? artifact { get; set; }
+    public Dictionary<string, Artifact>? classifiers { get; set; }
+}
+
+public class Extract
+{
+    public List<string>? exclude { get; set; }
+}
+
+public class Natives
+{
+    public string? linux { get; set; }
+    public string? osx { get; set; }
+    public string? windows { get; set; }
+}
+
+public class Library
+{
+    [JsonRequired] public string name { get; set; } = "";
+    public List<Rule>? rules { get; set; }
+    public Natives? natives { get; set; }
+    public Extract? extract { get; set; }
+    [JsonRequired] public LibraryDownloads downloads { get; set; } = null!;
+}
+
+public class AssetIndexProperties
+{
+    [JsonRequired] public string id { get; set; } = "";
+    [JsonRequired] public string url { get; set; } = "";
+    [JsonRequired] public string sha1 { get; set; } = "";
+    [JsonRequired] public int size { get; set; }
+    [JsonRequired] public int totalSize { get; set; }
+}
+
+public class Downloads
+{
+    [JsonRequired] public Artifact client { get; set; } = null!;
+}
+
+public class JavaVersion
+{
+    [JsonRequired] public string component { get; set; } = "";
+    [JsonRequired] public int majorVersion { get; set; }
+}
+
+public class ArgValue
+{
+    public struct StringOrArray : IEnumerable<string>
+    {
+        private string[] ar;
+
+        public StringOrArray(ICollection<string> v) => ar = v.ToArray();
+        public StringOrArray(string v) => ar = [v];
+        public static implicit operator StringOrArray(string[] v) => new(v);
+        public static implicit operator StringOrArray(string v) => new(v);
+        public static implicit operator string[](StringOrArray sar) => sar.ar;
+        public IEnumerator<string> GetEnumerator() => ar.AsEnumerable().GetEnumerator();
+        IEnumerator IEnumerable.GetEnumerator() => ar.GetEnumerator();
+    }
+    public ArgValue() { }
+    public ArgValue(string arg) => value = arg;
+    public static implicit operator ArgValue(string arg) => new(arg);
+    [JsonRequired] public StringOrArray value { get; set; } = [];
+    public List<Rule> rules { get; set; } = new();
+}
+
+public class ArgumentsNew
+{
+    [JsonRequired] public List<ArgValue> jvm { get; set; } = new();
+    [JsonRequired] public List<ArgValue> game { get; set; } = new();
+}

Mlaumcherb.Client.Avalonia/классы/Буржуазия/JavaVersionCatalog.cs

@@ -0,0 +1,85 @@
+using System.Runtime.InteropServices;
+using Mlaumcherb.Client.Avalonia.холопы;
+
+namespace Mlaumcherb.Client.Avalonia.классы;
+
+public class JavaVersionCatalog
+{
+    [JsonProperty("linux")]
+    public Dictionary<string, JavaVersionProps[]>? linux_x86 { get; set; }
+    [JsonProperty("linux-i386")] 
+    public Dictionary<string, JavaVersionProps[]>? linux_x64 { get; set; }
+    [JsonProperty("mac-os")] 
+    public Dictionary<string, JavaVersionProps[]>? osx_x64 { get; set; }
+    [JsonProperty("mac-os-arm64")] 
+    public Dictionary<string, JavaVersionProps[]>? osx_arm64 { get; set; }
+    [JsonProperty("windows-arm64")] 
+    public Dictionary<string, JavaVersionProps[]>? windows_arm64 { get; set; }
+    [JsonProperty("windows-x64")]
+    public Dictionary<string, JavaVersionProps[]>? windows_x64 { get; set; }
+    [JsonProperty("windows-x86")] 
+    public Dictionary<string, JavaVersionProps[]>? windows_x86 { get; set; }
+
+    public JavaVersionProps GetVersionProps(JavaVersion version)
+    {
+        var arch = RuntimeInformation.OSArchitecture;
+        Dictionary<string, JavaVersionProps[]>? propsDict = null;
+        switch (arch)
+        {
+            case Architecture.X86:
+                if (OperatingSystem.IsWindows())
+                    propsDict = windows_x86;
+                else if (OperatingSystem.IsLinux())
+                    propsDict = linux_x86;
+                break;
+            case Architecture.X64:
+                if (OperatingSystem.IsWindows())
+                    propsDict = windows_x64;
+                else if (OperatingSystem.IsLinux())
+                    propsDict = linux_x64;
+                else if (OperatingSystem.IsMacOS())
+                    propsDict = osx_x64;
+                break;
+            case Architecture.Arm64:
+                if (OperatingSystem.IsWindows())
+                    propsDict = windows_arm64;
+                else if (OperatingSystem.IsMacOS())
+                    propsDict = osx_arm64;
+                break;
+        }
+
+        if (propsDict != null && propsDict.TryGetValue(version.component, out var props_array))
+        {
+            if (props_array.Length != 0)
+                return props_array[0];
+        }
+        
+        throw new PlatformNotSupportedException($"Can't download java {version.majorVersion} for your operating system. " +
+              $"Download it manually to directory {PathHelper.GetJavaRuntimeDir(version.component)}");
+    }
+}
+
+public class JavaVersionProps
+{
+    /// url of JavaDistributiveManifest
+    [JsonRequired] public Artifact manifest { get; set; } = null!;
+}
+
+public class JavaDistributiveManifest
+{
+    [JsonRequired] public Dictionary<string, JavaDistributiveElementProps> files { get; set; } = new();
+}
+
+public class JavaDistributiveElementProps
+{
+    /// "directory" / "file"
+    [JsonRequired] public string type { get; set; } = "";
+    public bool? executable { get; set; }
+    public JavaCompressedArtifact? downloads { get; set; }
+}
+
+public class JavaCompressedArtifact
+{
+    public Artifact? lzma { get; set; }
+    [JsonRequired] public Artifact raw { get; set; } = null!;
+}

Mlaumcherb.Client.Avalonia/классы/Буржуазия/Rules.cs

@@ -0,0 +1,40 @@
+using Mlaumcherb.Client.Avalonia.холопы;
+
+namespace Mlaumcherb.Client.Avalonia.классы;
+
+public static class Rules
+{
+    public static bool Check(ICollection<Rule>? rules, ICollection<string> features)
+    {
+        if(rules is null || rules.Count == 0)
+            return true;
+        
+        bool allowed = false;
+        foreach (var r in rules)
+        {
+            if (r.os != null && !PlatformHelper.CheckOs(r.os)) 
+                continue;
+            
+            if (r.features == null)
+                allowed = r.action == "allow";
+            else
+            {
+                foreach (var feature in features)
+                {
+                    if (r.features.TryGetValue(feature, out bool is_enabled))
+                    {
+                        if (is_enabled)
+                        {
+                            allowed = r.action == "allow";
+                        }
+                    }
+                }
+            }
+            
+            if(allowed)
+                break;
+        }
+
+        return allowed;
+    }
+}

Mlaumcherb.Client.Avalonia/классы/Пролетариат/ArgumentsWithPlaceholders.cs

@@ -0,0 +1,31 @@
+namespace Mlaumcherb.Client.Avalonia.классы;
+
+public class ArgumentsWithPlaceholders
+{
+    protected List<string> _raw_args = new();
+
+    public IEnumerable<string> FillPlaceholders(Dictionary<string, string> values)
+    {
+        foreach (var _s in _raw_args)
+        {
+            string arg = _s;
+            int begin = arg.IndexOf("${", StringComparison.Ordinal);
+            while(begin != -1)
+            {
+                int keyBegin = begin + 2;
+                int end = arg.IndexOf('}', keyBegin);
+                if (end != -1)
+                {
+                    var key = arg.Substring(keyBegin, end - keyBegin);
+                    if (!values.TryGetValue(key, out var value))
+                        throw new Exception($"can't find value for placeholder '{key}'");
+                    arg = arg.Replace("${"+ key + "}", value);
+                }
+                if(end + 1 < arg.Length)
+                    begin = arg.IndexOf("${", end + 1, StringComparison.Ordinal);
+                else break;
+            }
+            yield return arg;
+        }
+    }
+}

Mlaumcherb.Client.Avalonia/классы/Пролетариат/GameArguments.cs

@@ -0,0 +1,41 @@
+using DTLib.Extensions;
+
+namespace Mlaumcherb.Client.Avalonia.классы;
+
+public class GameArguments : ArgumentsWithPlaceholders
+{
+    private static readonly string[] _initial_arguments =
+    [
+        "--width", "${resolution_width}",
+        "--height", "${resolution_height}",
+    ];
+    
+    private static readonly string[] _enabled_features =
+    [
+    ];
+    
+    public GameArguments(GameVersionDescriptor d)
+    {
+        _raw_args.AddRange(_initial_arguments);
+        
+        if (d.minecraftArguments is not null)
+        {
+            _raw_args.AddRange(d.minecraftArguments.SplitToList(' ', quot: '"'));
+        }
+        else if (d.arguments is not null)
+        {
+            foreach (var av in d.arguments.game)
+            {
+                if(Rules.Check(av.rules, _enabled_features))
+                {
+                    foreach (var arg in av.value)
+                    {
+                        // if(!_raw_args.Contains(arg))
+                            _raw_args.Add(arg);
+                    }
+                }
+            }
+        }
+        else throw new Exception("no game arguments specified in descriptor");
+    }
+}

Mlaumcherb.Client.Avalonia/классы/Пролетариат/GameVersionCatalogProps.cs

@@ -0,0 +1,17 @@
+using Mlaumcherb.Client.Avalonia.сеть;
+
+namespace Mlaumcherb.Client.Avalonia.классы;
+
+
+public class GameVersionCatalogProps
+{
+    [JsonRequired] public required string name { get; init; }
+    [JsonRequired] public required string url { get; init; }
+        
+    public override string ToString() => name;
+    
+    public async Task<GameVersionCatalog> GetVersionCatalogAsync()
+    {
+        return await NetworkHelper.DownloadStringAndDeserialize<GameVersionCatalog>(url);
+    }
+}

Mlaumcherb.Client.Avalonia/классы/Пролетариат/InstalledGameVersionProps.cs

@@ -0,0 +1,134 @@
+using Mlaumcherb.Client.Avalonia.зримое;
+using Mlaumcherb.Client.Avalonia.сеть;
+using Mlaumcherb.Client.Avalonia.холопы;
+using Newtonsoft.Json.Linq;
+
+namespace Mlaumcherb.Client.Avalonia.классы;
+
+public class InstalledGameVersionProps : IComparable<InstalledGameVersionProps>, IEquatable<InstalledGameVersionProps>
+{
+    [JsonRequired] public string Id { get; }
+    public GameVersionCatalogProps? CatalogProps { get; set; }
+
+    public RemoteVersionDescriptorProps? DescriptorProps { get; set; }
+    
+
+    private bool _isInstalled;
+    [JsonIgnore]
+    public bool IsInstalled
+    {
+        get => _isInstalled;
+        set
+        {
+            _isInstalled = value;
+            StatusChanged?.Invoke(value);
+        }
+    }
+
+    [JsonIgnore] public IOPath DescriptorPath { get; }
+    
+    public event Action<bool>? StatusChanged;
+
+    public InstalledGameVersionProps(string id, GameVersionCatalogProps? catalogProps, RemoteVersionDescriptorProps? descriptorProps)
+    {
+        this.Id = id;
+        this.CatalogProps = catalogProps;
+        this.DescriptorProps = descriptorProps;
+        DescriptorPath = PathHelper.GetVersionDescriptorPath(id);
+        IsInstalled = File.Exists(PathHelper.GetVersionJarFilePath(id));
+    }
+
+    public async Task<GameVersion> LoadDescriptor(bool checkForUpdates)
+    {
+        // check if DescriptorProps had been changed on on remote version catalog server
+        if (checkForUpdates && CatalogProps is not null && DescriptorProps is not null)
+        {
+            var remoteCatalog = await NetworkHelper.DownloadStringAndDeserialize<GameVersionCatalog>(CatalogProps.url);
+
+            DescriptorProps = remoteCatalog.versions.Find(remoteProps => remoteProps.id == Id);
+            if(DescriptorProps is null)
+                LauncherApp.Logger.LogWarn(nameof(InstalledGameVersionProps), 
+                    $"Game version '{Id}' was deleted from remote catalog '{CatalogProps.name}'."
+                    + "It is kept locally, but can't be updated anymore.");
+        }
+        
+        // Descriptor is downloaded here
+        if (!HashHelper.CheckFileSHA1(DescriptorPath, DescriptorProps?.sha1, checkForUpdates))
+        {
+            if (DescriptorProps is null)
+                throw new NullReferenceException(
+                    $"can't download game version descriptor '{Id}', because RemoteDescriptor is null");
+            // download descriptor
+            await NetworkHelper.DownloadFile(DescriptorProps.url, DescriptorPath);
+        }
+
+        string descriptorText = File.ReadAllText(DescriptorPath);
+        JObject descriptorRaw =  JObject.Parse(descriptorText);
+        
+        // Descriptors can inherit from other descriptors.
+        // For example, 1.12.2-forge-14.23.5.2860 inherits from 1.12.2
+        if (descriptorRaw.TryGetValue("inheritsFrom", out var v))
+        {
+            string parentDescriptorId = v.Value<string>() 
+                                        ?? throw new Exception("inheritsFrom is null");
+            LauncherApp.Logger.LogInfo(Id, $"merging descriptor '{parentDescriptorId}' with '{Id}'");
+            IOPath parentDescriptorPath = PathHelper.GetVersionDescriptorPath(parentDescriptorId);
+            if (!File.Exists(parentDescriptorPath))
+                throw new Exception($"Версия '{Id} требует установить версию '{parentDescriptorId}'");
+            string parentDescriptorText = File.ReadAllText(parentDescriptorPath);
+            JObject parentDescriptorRaw = JObject.Parse(parentDescriptorText);
+            parentDescriptorRaw.Merge(descriptorRaw,
+                new JsonMergeSettings { MergeArrayHandling = MergeArrayHandling.Concat });
+            descriptorRaw = parentDescriptorRaw;
+            // removing dependency
+            descriptorRaw.Remove("inheritsFrom");
+            File.WriteAllText(DescriptorPath, descriptorRaw.ToString());
+        }
+
+        var descriptor = descriptorRaw.ToObject<GameVersionDescriptor>()
+                      ?? throw new Exception($"can't parse descriptor file '{DescriptorPath}'");
+        
+        return new GameVersion(this, descriptor);
+    }
+    
+    public void Delete()
+    {
+        if(!IsInstalled)
+            return;
+        
+        LauncherApp.Logger.LogInfo(Id, "Deleting files...");
+        var verdir = PathHelper.GetVersionDir(Id);
+        if(Directory.Exists(verdir))
+            Directory.Delete(verdir);
+        LauncherApp.Logger.LogInfo(Id, "Files deleted");
+        IsInstalled = false;
+    }
+    
+    public override string ToString() => Id;
+
+    public override int GetHashCode() => Id.GetHashCode();
+
+    public int CompareTo(InstalledGameVersionProps? other)
+    {
+        if (ReferenceEquals(this, other)) 
+            return 0;
+        if (other is null) 
+            return 1;
+        
+        return String.Compare(Id, other.Id, StringComparison.InvariantCulture);
+    }
+
+    public bool Equals(InstalledGameVersionProps? other)
+    {
+        if (other is null) return false;
+        if (ReferenceEquals(this, other)) return true;
+        return Id == other.Id;
+    }
+
+    public override bool Equals(object? obj)
+    {
+        if (obj is InstalledGameVersionProps other) return Equals(other);
+        if (ReferenceEquals(this, obj)) return true;
+        return false;
+    }
+}

Mlaumcherb.Client.Avalonia/классы/Пролетариат/InstalledVersionCatalog.cs

@@ -0,0 +1,77 @@
+using System.Linq;
+using Mlaumcherb.Client.Avalonia.зримое;
+using Mlaumcherb.Client.Avalonia.холопы;
+
+namespace Mlaumcherb.Client.Avalonia.классы;
+
+public class InstalledVersionCatalog
+{
+    /// version_id, props
+    [JsonRequired] public Dictionary<string, InstalledGameVersionProps> versions { get; set; } = new();
+
+    private IComparer<InstalledGameVersionProps> reverseComparer = new ReverseComparer<InstalledGameVersionProps>();
+    
+    public static InstalledVersionCatalog Load()
+    {
+        InstalledVersionCatalog catalog;
+        var installedCatalogPath = PathHelper.GetInstalledVersionCatalogPath();
+        if (!File.Exists(installedCatalogPath))
+        {
+            LauncherApp.Logger.LogDebug(nameof(InstalledVersionCatalog), "creating new catalog");
+            catalog = new InstalledVersionCatalog();
+        }
+        else
+        {
+            LauncherApp.Logger.LogDebug(nameof(InstalledVersionCatalog), "loading catalog from file");
+            catalog = JsonConvert.DeserializeObject<InstalledVersionCatalog>(
+                          File.ReadAllText(installedCatalogPath))
+                      ?? throw new NullReferenceException($"can't deserialize {installedCatalogPath}");
+        }
+
+        catalog.CheckInstalledVersions();
+        catalog.Save();
+        return catalog;
+    }
+
+    public void Save()
+    {
+        var installedCatalogPath = PathHelper.GetInstalledVersionCatalogPath();
+        LauncherApp.Logger.LogDebug(nameof(InstalledVersionCatalog), "saving catalog to file");
+        var text = JsonConvert.SerializeObject(this, Formatting.Indented);
+        File.WriteAllText(installedCatalogPath, text);
+        LauncherApp.Logger.LogDebug(nameof(InstalledVersionCatalog), "catalog has been saved");
+    }
+
+    /// <summary>
+    /// Check if any versions were installed or deleted manually.
+    /// </summary>
+    public void CheckInstalledVersions()
+    {
+        var versionsUpdated = new List<InstalledGameVersionProps>();
+        Directory.Create(PathHelper.GetVersionsDir());
+        foreach (var subdir in Directory.GetDirectories(PathHelper.GetVersionsDir()))
+        {
+            string id = subdir.LastName().ToString();
+            if (!File.Exists(PathHelper.GetVersionDescriptorPath(id)))
+                throw new Exception(
+                    $"Can't find version descriptor file in directory '{subdir}'. Rename it as directory name.");
+            
+            if (versions.TryGetValue(id, out var foundProps))
+            {
+                versionsUpdated.Add(foundProps);
+            }
+            else
+            {
+                versionsUpdated.Add(new InstalledGameVersionProps(id, null, null));
+            }
+        }
+
+        // reverse sort
+        versionsUpdated.Sort(reverseComparer);
+        // create dictionary from list
+        versions = new Dictionary<string, InstalledGameVersionProps>(
+            versionsUpdated.Select(props =>
+                new KeyValuePair<string, InstalledGameVersionProps>(props.Id, props)
+            ));
+    }
+}

Mlaumcherb.Client.Avalonia/классы/Пролетариат/JavaArguments.cs

@@ -0,0 +1,54 @@
+namespace Mlaumcherb.Client.Avalonia.классы;
+
+public class JavaArguments : ArgumentsWithPlaceholders
+{
+    private static readonly string[] _initial_arguments =
+    [
+        "-XX:+UnlockExperimentalVMOptions",
+        "-XX:+UseG1GC",
+        "-XX:G1NewSizePercent=20",
+        "-XX:G1ReservePercent=20",
+        "-XX:MaxGCPauseMillis=50",
+        "-XX:G1HeapRegionSize=32M",
+        "-XX:+DisableExplicitGC",
+        "-XX:+AlwaysPreTouch",
+        "-XX:+ParallelRefProcEnabled",
+        "-Xms${xms}M",
+        "-Xmx${xmx}M",
+        "-Dfile.encoding=UTF-8",
+        "-Dlog4j.configurationFile=${path}",
+        "-Djava.library.path=${natives_directory}",
+        "-Dminecraft.client.jar=${client_jar}",
+        "-Dminecraft.launcher.brand=${launcher_name}",
+        "-Dminecraft.launcher.version=${launcher_version}",
+    ];
+
+    private static readonly string[] _enabled_features = 
+    [
+    ];
+
+    public JavaArguments(GameVersionDescriptor d)
+    {
+        _raw_args.AddRange(_initial_arguments);
+        if (d.arguments is not null)
+        {
+            foreach (var av in d.arguments.jvm)
+            {
+                if (Rules.Check(av.rules, _enabled_features))
+                {
+                    foreach (var arg in av.value)
+                    {
+                        // if(!_raw_args.Contains(arg))
+                            _raw_args.Add(arg);
+                    }
+                }
+            }
+        }
+
+        if (!_raw_args.Contains("-cp"))
+        {
+            _raw_args.Add("-cp");
+            _raw_args.Add("${classpath}");
+        }
+    }
+}

Mlaumcherb.Client.Avalonia/классы/Пролетариат/Libraries.cs

@@ -0,0 +1,88 @@
+using DTLib.Extensions;
+using Mlaumcherb.Client.Avalonia.холопы;
+
+namespace Mlaumcherb.Client.Avalonia.классы;
+
+public class Libraries
+{
+    private static readonly string[] enabled_features = [];
+    
+    public record JarLib(string name, IOPath jarFilePath, Artifact artifact);
+    public record NativeLib(string name, IOPath jarFilePath, Artifact artifact, Extract? extractionOptions) 
+        : JarLib(name, jarFilePath, artifact);
+    
+    public IReadOnlyCollection<JarLib> Libs { get; }
+
+    private IOPath GetJarFilePath(Artifact artifact)
+    {
+        string relativePath;
+        if (!string.IsNullOrEmpty(artifact.path))
+            relativePath = artifact.path;
+        else if (!string.IsNullOrEmpty(artifact.url))
+            relativePath = artifact.url.AsSpan().After("://").After('/').ToString();
+        else throw new ArgumentException("Artifact must have a path or url");
+
+        return Path.Concat(PathHelper.GetLibrariesDir(), relativePath);
+    }
+    
+    public Libraries(GameVersionDescriptor descriptor)
+    {
+        List<JarLib> libs = new();
+        HashSet<string> libHashes = new();
+        
+        foreach (var l in descriptor.libraries)
+        {
+            if (l.rules != null && !Rules.Check(l.rules, enabled_features))
+                continue;
+
+            if (l.natives != null)
+            {
+                string? nativesKey;
+                if (OperatingSystem.IsWindows())
+                    nativesKey = l.natives.windows;
+                else if (OperatingSystem.IsLinux())
+                    nativesKey = l.natives.linux;
+                else if (OperatingSystem.IsMacOS())
+                    nativesKey = l.natives.osx;
+                else throw new PlatformNotSupportedException();
+                if(nativesKey is null)
+                    throw new Exception($"nativesKey for '{l.name}' is null");
+                
+                // example: "natives-windows-${arch}"
+                if (nativesKey.Contains('$'))
+                {
+                    var span = nativesKey.AsSpan();
+                    nativesKey = span.After("${").Before('}') switch
+                    {
+                        "arch" => span.Before("${").ToString() + PlatformHelper.GetArchOld(),
+                        _ => throw new Exception($"unknown placeholder in {nativesKey}")
+                    };
+                }
+                
+                Artifact artifact = null!;
+                if(l.downloads.classifiers != null && !l.downloads.classifiers.TryGetValue(nativesKey, out artifact!))
+                    throw new Exception($"can't find artifact for '{l.name}' with nativesKey '{nativesKey}'");
+                
+                // skipping duplicates (WHO THE HELL CREATES THIS DISCRIPTORS AAAAAAAAA)
+                if(!libHashes.Add(artifact.sha1))
+                    continue;
+                
+                libs.Add(new NativeLib(l.name, GetJarFilePath(artifact), artifact, l.extract));
+            }
+            else
+            {
+                Artifact? artifact = l.downloads.artifact;
+                if (artifact == null)
+                    throw new NullReferenceException($"artifact for '{l.name}' is null");
+                
+                // skipping duplicates
+                if(!libHashes.Add(artifact.sha1))
+                    continue;
+                
+                libs.Add(new JarLib(l.name, GetJarFilePath(artifact), artifact));
+            }
+        }
+
+        Libs = libs;
+    }
+}

Mlaumcherb.Client.Avalonia/классы/Пролетариат/MyModpack.cs

@@ -0,0 +1,53 @@
+using Mlaumcherb.Client.Avalonia.холопы;
+
+namespace Mlaumcherb.Client.Avalonia.классы;
+
+public class MyModpackRemoteProps
+{
+    [JsonRequired] public int format_version { get; set; }
+    [JsonRequired] public Artifact artifact { get; set; } = null!;
+}
+
+public class MyModpackV1
+{
+    // 1
+    [JsonRequired] public int format_version { get; set; }
+    [JsonRequired] public string name { get; set; } = "";
+    // zip archive with all files
+    [JsonRequired] public Artifact zip { get; set; } = null!;
+    /// relative_path, hash
+    // ReSharper disable once CollectionNeverUpdated.Global
+    [JsonRequired] public Dictionary<string, FileProps> files { get; set; } = new();
+    
+    
+    public class FileProps
+    {
+        [JsonRequired] public string sha1 { get; set; } = "";
+        // disable hash validation, allowing users to edit this file
+        public bool allow_edit { get; set; }
+        // don't re-download file if it was deleted by user
+        public bool optional { get; set; }
+    }
+
+    /// <param name="unmatchedFilesLocalPaths">relative, absolute</param>
+    public Dictionary<IOPath, IOPath> CheckFiles(IOPath basedir, bool checkHashes, bool downloadOptionalFiles)
+    {
+        Dictionary<IOPath, IOPath> unmatchedFiles = new();
+        IOPath launcherRoot = PathHelper.GetRootFullPath();
+        foreach (var p in files)
+        {
+            if(!downloadOptionalFiles && p.Value.optional)
+                continue;
+            
+            IOPath relativePath = new IOPath(p.Key);
+            var absolutePath = Path.Concat(relativePath.StartsWith("libraries") 
+                ? launcherRoot : basedir, relativePath);
+            if (!HashHelper.CheckFileSHA1(absolutePath, p.Value.sha1, checkHashes && !p.Value.allow_edit))
+            {
+                unmatchedFiles.Add(relativePath, absolutePath);
+            }
+        }
+
+        return unmatchedFiles;
+    }
+}

Mlaumcherb.Client.Avalonia/сеть/DataSize.cs

@@ -0,0 +1,23 @@
+namespace Mlaumcherb.Client.Avalonia.сеть;
+
+public record struct DataSize(long Bytes)
+{
+    static string BytesToHumanReadable(long bytes)
+    {
+        long K = bytes / 1024;
+        if (K == 0)
+            return $"{bytes}b";
+        float M = K / 1024f;
+        if (M < 1)
+            return $"{K:N1}Kb";
+        float G = M / 1024f;
+        if (G < 1)
+            return $"{M:N1}Mb";
+        return $"{G:N1}Gb";
+    }
+
+    public override string ToString() => BytesToHumanReadable(Bytes);
+    
+    public static implicit operator DataSize(long bytes) => new DataSize(bytes);
+}
+

Mlaumcherb.Client.Avalonia/сеть/NetworkHelper.cs

@@ -0,0 +1,66 @@
+using System.Net.Http;
+using Mlaumcherb.Client.Avalonia.холопы;
+
+namespace Mlaumcherb.Client.Avalonia.сеть;
+
+public static class NetworkHelper
+{
+    private static HttpClient _http = new();
+
+    static NetworkHelper()
+    {
+        // thanks for Sashok :3
+        // https://github.com/new-sashok724/Launcher/blob/23485c3f7de6620d2c6b7b2dd9339c3beb6a0366/Launcher/source/helper/IOHelper.java#L259
+        _http.DefaultRequestHeaders.Add("User-Agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)");
+    }
+
+    public static Task<string> GetString(string url, CancellationToken ct = default) => _http.GetStringAsync(url, ct);
+    public static Task<Stream> GetStream(string url, CancellationToken ct = default) => _http.GetStreamAsync(url, ct);
+    
+    public static async Task DownloadFile(string url, Stream outStream, CancellationToken ct = default, 
+        params TransformStream.TransformFuncDelegate[] transforms)
+    {
+        await using var pipe = new TransformStream(await GetStream(url, ct));
+        if (transforms.Length > 0) 
+            pipe.AddTransforms(transforms);
+        await pipe.CopyToAsync(outStream, ct);
+    }
+    
+    public static async Task DownloadFile(string url, IOPath outPath, CancellationToken ct = default, 
+        params TransformStream.TransformFuncDelegate[] transforms)
+    {
+        await using var file = File.OpenWrite(outPath);
+        await DownloadFile(url, file, ct, transforms);
+    }
+    
+    public static async Task<T> DownloadStringAndDeserialize<T>(string url)
+    {
+        var text = await GetString(url);
+        var result = JsonConvert.DeserializeObject<T>(text)
+            ?? throw new Exception($"can't deserialize {typeof(T).Name}");
+        return result;
+    }
+    
+    
+    /// <returns>(file_content, didDownload)</returns>
+    public static async Task<(string, bool)> ReadOrDownload(IOPath filePath, string url, 
+        string? sha1, bool checkHashes)
+    {
+        if (HashHelper.CheckFileSHA1(filePath, sha1, checkHashes)) 
+            return (File.ReadAllText(filePath), false);
+        
+        string txt = await NetworkHelper.GetString(url);
+        File.WriteAllText(filePath, txt);
+        return (txt, true);
+    }
+
+    /// <returns>(file_content, didDownload)</returns>
+    public static async Task<(T, bool)> ReadOrDownloadAndDeserialize<T>(IOPath filePath, string url,
+        string? sha1, bool checkHashes)
+    {
+        (string text, bool didDownload) = await ReadOrDownload(filePath, url, sha1, checkHashes);
+        var result = JsonConvert.DeserializeObject<T>(text)
+                     ?? throw new Exception($"can't deserialize {typeof(T).Name}");
+        return (result, didDownload);
+    }
+}

Mlaumcherb.Client.Avalonia/сеть/NetworkProgressReporter.cs

@@ -0,0 +1,61 @@
+using Mlaumcherb.Client.Avalonia.зримое;
+using Timer = DTLib.Timer;
+
+namespace Mlaumcherb.Client.Avalonia.сеть;
+
+public record struct DownloadProgress(DataSize Downloaded, DataSize Total, DataSize PerSecond)
+{
+    public override string ToString()
+    {
+        return $"{Downloaded}/{Total} ({PerSecond}/s)";
+    }
+}
+
+public class NetworkProgressReporter : IDisposable
+{
+    private readonly Action<DownloadProgress> _reportProgressDelegate;
+    private long _totalSize;
+    private long _curSize;
+    private long _prevSize;
+    private int _timerDelay = 1000;
+    private Timer _timer;
+    
+    public NetworkProgressReporter(long totalSize, Action<DownloadProgress> reportProgressDelegate)
+    {
+        _totalSize = totalSize;
+        _reportProgressDelegate = reportProgressDelegate;
+        _timer = new Timer(true, _timerDelay, ReportProgress);
+    }
+
+    // atomic add
+    public void AddBytesCount(byte[] buffer, int offset, int count)
+    {
+        Interlocked.Add(ref _curSize, count);
+    }
+    
+    public void Start()
+    {
+        _timer.Start();
+    }
+
+    public void Stop()
+    {
+        _timer.Stop();
+        _timer.InvokeAction();
+    }
+
+    public void Dispose()
+    {
+        Stop();
+    }
+
+    void ReportProgress()
+    {
+        long bytesPerSec = (_curSize - _prevSize) / (_timerDelay / 1000);
+        _prevSize = _curSize;
+        var p = new DownloadProgress(_curSize, _totalSize, bytesPerSec);
+        LauncherApp.Logger.LogDebug(nameof(ReportProgress),
+            $"download progress {p}");
+        _reportProgressDelegate(p);
+    }
+}

Mlaumcherb.Client.Avalonia/сеть/NetworkTask.cs

@@ -0,0 +1,77 @@
+namespace Mlaumcherb.Client.Avalonia.сеть;
+
+public class NetworkTask : IDisposable
+{
+    public readonly string Name;
+
+    public enum Status
+    {
+        Initialized,
+        Started,
+        Completed,
+        Cancelled,
+        Failed
+    };
+
+    public Status DownloadStatus { get; private set; } = Status.Initialized;
+
+    public event Action? OnStart; 
+    public event Action<DownloadProgress>? OnProgress;
+    public event Action<Status>? OnStop; 
+
+    public delegate Task DownloadAction(NetworkProgressReporter progressReporter, CancellationToken ct);
+
+    private readonly DownloadAction _downloadAction;
+    private CancellationTokenSource _cts = new();
+    private NetworkProgressReporter _progressReporter;
+
+    public NetworkTask(string name, long dataSize, DownloadAction downloadAction)
+    {
+        Name = name;
+        _downloadAction = downloadAction;
+        _progressReporter = new NetworkProgressReporter(dataSize, ReportProgress);
+    }
+    
+    private void ReportProgress(DownloadProgress p) => OnProgress?.Invoke(p);
+
+    public async Task StartAsync()
+    {
+        if(DownloadStatus == Status.Started || DownloadStatus == Status.Completed)
+            return;
+        DownloadStatus = Status.Started;
+        try
+        {
+            _progressReporter.Start();
+            OnStart?.Invoke();
+            await _downloadAction(_progressReporter, _cts.Token);
+            DownloadStatus = Status.Completed;
+        }
+        catch (OperationCanceledException)
+        {
+            DownloadStatus = Status.Cancelled;
+        }
+        catch
+        {
+            DownloadStatus = Status.Failed;
+            throw;
+        }
+        finally
+        {
+            _progressReporter.Stop();
+            OnStop?.Invoke(DownloadStatus);
+        }
+    } 
+
+    public void Cancel()
+    {
+        DownloadStatus = Status.Cancelled;
+        _cts.Cancel();
+        _cts = new CancellationTokenSource();
+    }
+
+    public void Dispose()
+    {
+        _cts.Dispose();
+        _progressReporter.Dispose();
+    }
+}

Mlaumcherb.Client.Avalonia/сеть/TaskFactories/AssetsDownloadTaskFactory.cs

@@ -0,0 +1,123 @@
+using System.Net;
+using System.Net.Http;
+using Mlaumcherb.Client.Avalonia.зримое;
+using Mlaumcherb.Client.Avalonia.классы;
+using Mlaumcherb.Client.Avalonia.холопы;
+using static Mlaumcherb.Client.Avalonia.сеть.NetworkHelper;
+
+namespace Mlaumcherb.Client.Avalonia.сеть.TaskFactories;
+
+public class AssetsDownloadTaskFactory : INetworkTaskFactory
+{
+    private const string ASSET_SERVER_URL = "https://resources.download.minecraft.net/";
+    private GameVersionDescriptor _descriptor;
+    private IOPath _indexFilePath;
+    List<AssetDownloadProperties> _assetsToDownload = new();
+
+    public AssetsDownloadTaskFactory(GameVersionDescriptor descriptor)
+    {
+        _descriptor = descriptor;
+        _indexFilePath = PathHelper.GetAssetIndexFilePath(_descriptor.assetIndex.id);
+    }
+    
+    public async Task<NetworkTask?> CreateAsync(bool checkHashes)
+    {
+        NetworkTask? networkTask = null;
+        if (!await CheckFilesAsync(checkHashes))
+        {
+            networkTask = new NetworkTask(
+                $"assets '{_descriptor.assetIndex.id}'",
+                GetTotalSize(),
+                Download
+            );
+        }
+        
+        return networkTask;
+    }
+    private async Task<bool> CheckFilesAsync(bool checkHashes)
+    {
+        (AssetIndex assetIndex, _) = await ReadOrDownloadAndDeserialize<AssetIndex>(
+            _indexFilePath,
+            _descriptor.assetIndex.url, 
+            _descriptor.assetIndex.sha1,
+            checkHashes);
+        
+        // removing duplicates for Dictionary (idk how can it be possible, but Newtonsoft.Json creates them)
+        HashSet<string> assetHashes = new HashSet<string>();
+        foreach (var pair in assetIndex.objects)
+        {
+            if (assetHashes.Add(pair.Value.hash))
+            {
+                var a = new AssetDownloadProperties(pair.Key, pair.Value);
+                if (!HashHelper.CheckFileSHA1(a.filePath, a.hash, checkHashes))
+                {
+                    _assetsToDownload.Add(a);
+                }
+            }
+        }
+        
+        return _assetsToDownload.Count == 0;
+    }
+
+    private long GetTotalSize()
+    {
+        long totalSize = 0;
+        foreach (var a in _assetsToDownload) 
+            totalSize += a.size;
+        return totalSize;
+    }
+
+    private class AssetDownloadProperties
+    {
+        public string name;
+        public string hash;
+        public long size;
+        public string url;
+        public IOPath filePath;
+
+        public AssetDownloadProperties(string key, AssetProperties p)
+        {
+            name = key;
+            hash = p.hash;
+            size = p.size;
+            string hashStart = hash.Substring(0, 2);
+            url = $"{ASSET_SERVER_URL}/{hashStart}/{hash}";
+            filePath = Path.Concat(IOPath.ArrayCast(["assets", "objects", hashStart, hash], true));
+        }
+    }
+    
+    private async Task Download(NetworkProgressReporter pr, CancellationToken ct)
+    {
+        LauncherApp.Logger.LogInfo(nameof(NetworkHelper), $"started downloading assets '{_descriptor.assetIndex.id}'");
+        ParallelOptions opt = new()
+        {
+            MaxDegreeOfParallelism = LauncherApp.Config.max_parallel_downloads,
+            CancellationToken = ct
+        };
+        await Parallel.ForEachAsync(_assetsToDownload, opt, 
+        async (a, _ct) =>
+        {
+            bool completed = false;
+            while(!completed)
+            {
+                LauncherApp.Logger.LogDebug(nameof(NetworkHelper), $"downloading asset '{a.name}' {a.hash}");
+                try
+                {
+                    await DownloadFile(a.url, a.filePath, _ct, pr.AddBytesCount);
+                    completed = true;
+                }
+                catch (HttpRequestException httpException)
+                {
+                    // wait on rate limit
+                    if(httpException.StatusCode == HttpStatusCode.TooManyRequests)
+                    {
+                        LauncherApp.Logger.LogDebug(nameof(NetworkHelper), "rate limit hit");
+                        await Task.Delay(1000, _ct);
+                    }
+                    else throw;
+                }
+            }
+        });
+        LauncherApp.Logger.LogInfo(nameof(NetworkHelper), $"finished downloading assets '{_descriptor.assetIndex.id}'");
+    }
+}

Mlaumcherb.Client.Avalonia/сеть/TaskFactories/INetworkTaskFactory.cs

@@ -0,0 +1,7 @@
+namespace Mlaumcherb.Client.Avalonia.сеть.TaskFactories;
+
+public interface INetworkTaskFactory
+{
+    /// <returns>unstarted network task or null if there is nothing to download</returns>
+    Task<NetworkTask?> CreateAsync(bool checkHashes);
+}

Mlaumcherb.Client.Avalonia/сеть/TaskFactories/JavaDownloadTaskFactory.cs

@@ -0,0 +1,114 @@
+using Mlaumcherb.Client.Avalonia.зримое;
+using Mlaumcherb.Client.Avalonia.классы;
+using Mlaumcherb.Client.Avalonia.холопы;
+using static Mlaumcherb.Client.Avalonia.сеть.NetworkHelper;
+
+namespace Mlaumcherb.Client.Avalonia.сеть.TaskFactories;
+
+public class JavaDownloadTaskFactory : INetworkTaskFactory
+{
+    private const string CATALOG_URL =
+        "https://launchermeta.mojang.com/v1/products/java-runtime/2ec0cc96c44e5a76b9c8b7c39df7210883d12871/all.json";
+    private GameVersionDescriptor _descriptor;
+    private IOPath _javaVersionDir;
+    private JavaDistributiveManifest? _distributiveManifest;
+    private List<(IOPath path, JavaDistributiveElementProps props)> _filesToDownload = new();
+    
+    public JavaDownloadTaskFactory(GameVersionDescriptor descriptor)
+    {
+        _descriptor = descriptor;
+        _javaVersionDir = PathHelper.GetJavaRuntimeDir(_descriptor.javaVersion.component);
+    }
+
+    public async Task<NetworkTask?> CreateAsync(bool checkHashes)
+    {
+        var catalog = await DownloadStringAndDeserialize<JavaVersionCatalog>(CATALOG_URL);
+        var versionProps = catalog.GetVersionProps(_descriptor.javaVersion);
+        _distributiveManifest = await DownloadStringAndDeserialize<JavaDistributiveManifest>(versionProps.manifest.url);
+        
+        NetworkTask? networkTask = null;
+        if (!CheckFiles(checkHashes))
+        {
+            networkTask = new NetworkTask(
+                $"java runtime '{_descriptor.javaVersion.component}'",
+                GetTotalSize(),
+                Download
+            );
+        }
+        
+        return networkTask;
+    }
+
+    private bool CheckFiles(bool checkHashes)
+    {
+        _filesToDownload.Clear();
+        foreach (var pair in _distributiveManifest!.files)
+        {
+            if (pair.Value.type != "file")
+                continue;
+
+            if (pair.Value.downloads != null)
+            {
+                var artifact = pair.Value.downloads;
+                IOPath file_path = Path.Concat(_javaVersionDir, pair.Key);
+                if (!HashHelper.CheckFileSHA1(file_path, artifact.raw.sha1, checkHashes))
+                {
+                    _filesToDownload.Add((file_path, pair.Value));
+                }
+            }
+        }
+
+        return _filesToDownload.Count == 0;
+    }
+    
+    private long GetTotalSize()
+    {
+        long totalSize = 0;
+        foreach (var file in _filesToDownload)
+        {
+            if(file.props.downloads == null)
+                continue;
+            totalSize += file.props.downloads.lzma?.size ?? file.props.downloads.raw.size;
+        }
+        return totalSize;
+    }
+
+    private async Task Download(NetworkProgressReporter pr, CancellationToken ct)
+    {
+        LauncherApp.Logger.LogInfo(nameof(NetworkHelper), "started downloading java runtime " +
+                    $"{_descriptor.javaVersion.majorVersion} '{_descriptor.javaVersion.component}'");
+        
+        ParallelOptions opt = new()
+        {
+            MaxDegreeOfParallelism = LauncherApp.Config.max_parallel_downloads,
+            CancellationToken = ct
+        };
+        await Parallel.ForEachAsync(_filesToDownload, opt, async (f, _ct) =>
+        {
+            if (f.props.downloads!.lzma != null)
+            {
+                LauncherApp.Logger.LogDebug(nameof(NetworkHelper), $"downloading lzma-compressed file '{f.path}'");
+                await using var pipe = new TransformStream(await GetStream(f.props.downloads.lzma.url, _ct));
+                pipe.AddTransform(pr.AddBytesCount);
+                await using var fs = File.OpenWrite(f.path);
+                LZMAHelper.Decompress(pipe, fs);
+            }
+            else
+            {
+                LauncherApp.Logger.LogDebug(nameof(NetworkHelper), $"downloading raw file '{f.path}'");
+                await DownloadFile(f.props.downloads.raw.url, f.path, _ct, pr.AddBytesCount);
+            }
+            
+            if(!OperatingSystem.IsWindows() && f.props.executable is true)
+            {
+                LauncherApp.Logger.LogDebug(nameof(NetworkHelper), $"adding execute rights to file '{f.path}'");
+                System.IO.File.SetUnixFileMode(f.path.ToString(), UnixFileMode.UserExecute);
+            }
+        });
+        
+        LauncherApp.Logger.LogInfo(nameof(NetworkHelper), "finished downloading java runtime " + 
+                    $"{_descriptor.javaVersion.majorVersion} '{_descriptor.javaVersion.component}'");
+    }
+    
+    
+}

Mlaumcherb.Client.Avalonia/сеть/TaskFactories/LibrariesDownloadTaskFactory.cs

@@ -0,0 +1,100 @@
+using System.IO.Compression;
+using Mlaumcherb.Client.Avalonia.зримое;
+using Mlaumcherb.Client.Avalonia.классы;
+using Mlaumcherb.Client.Avalonia.холопы;
+using static Mlaumcherb.Client.Avalonia.сеть.NetworkHelper;
+
+namespace Mlaumcherb.Client.Avalonia.сеть.TaskFactories;
+
+public class LibrariesDownloadTaskFactory : INetworkTaskFactory
+{
+    private GameVersionDescriptor _descriptor;
+    private Libraries _libraries;
+    private List<Libraries.JarLib> _libsToDownload = new();
+    private IOPath _nativesDir;
+
+    public LibrariesDownloadTaskFactory(GameVersionDescriptor descriptor, Libraries libraries)
+    {
+        _descriptor = descriptor;
+        _libraries = libraries;
+        _nativesDir = PathHelper.GetNativeLibrariesDir(descriptor.id);
+    }
+    
+    public Task<NetworkTask?> CreateAsync(bool checkHashes)
+    {
+        NetworkTask? networkTask = null;
+        if (!CheckFiles(checkHashes))
+        {
+            networkTask = new NetworkTask(
+                $"libraries '{_descriptor.id}'",
+                GetTotalSize(),
+                Download
+            );
+        }
+        
+        return Task.FromResult(networkTask);
+    }
+    
+    private bool CheckFiles(bool checkHashes)
+    {
+        _libsToDownload.Clear();
+        bool nativeDirExists = Directory.Exists(_nativesDir);
+        
+        foreach (var l in _libraries.Libs)
+        {
+            if (!HashHelper.CheckFileSHA1(l.jarFilePath, l.artifact.sha1, checkHashes))
+            {
+                _libsToDownload.Add(l);
+            }
+            //TODO: replace with actual native libraries check
+            else if (!nativeDirExists && l is Libraries.NativeLib)
+            {
+                _libsToDownload.Add(l);
+            }
+        }
+
+        return _libsToDownload.Count == 0;
+    }
+    
+    private long GetTotalSize()
+    {
+        long total = 0;
+        foreach (var l in _libsToDownload)
+            total += l.artifact.size;
+        return total;
+    }
+
+    private async Task Download(NetworkProgressReporter pr, CancellationToken ct)
+    {
+        LauncherApp.Logger.LogInfo(nameof(NetworkHelper), $"started downloading libraries '{_descriptor.id}'");
+        
+        ParallelOptions opt = new()
+        {
+            MaxDegreeOfParallelism = LauncherApp.Config.max_parallel_downloads,
+            CancellationToken = ct
+        };
+        await Parallel.ForEachAsync(_libsToDownload, opt, async (l, _ct) =>
+        {
+            LauncherApp.Logger.LogDebug(nameof(NetworkHelper), $"downloading library '{l.name}' to '{l.jarFilePath}'");
+            if(string.IsNullOrEmpty(l.artifact.url))
+                throw new Exception($"library '{l.name}' doesn't have a url to download");
+            await DownloadFile(l.artifact.url, l.jarFilePath, _ct, pr.AddBytesCount);
+            if (l is Libraries.NativeLib n)
+            {
+                await using var zipf = File.OpenRead(n.jarFilePath);
+                using var archive = new ZipArchive(zipf);
+                foreach (var entry in archive.Entries)
+                {
+                    if (n.extractionOptions?.exclude?.Contains(entry.FullName) is true or null) 
+                        continue;
+                    
+                    var real_path = Path.Concat(_nativesDir, entry.FullName);
+                    Directory.Create(real_path.ParentDir());
+                    entry.ExtractToFile(real_path.ToString(), true);
+                }
+            }
+        });
+        
+        LauncherApp.Logger.LogInfo(nameof(NetworkHelper), $"finished downloading libraries '{_descriptor.id}'");
+    }
+}

Mlaumcherb.Client.Avalonia/сеть/TaskFactories/ModpackDownloadTaskFactory.cs

@@ -0,0 +1,27 @@
+using Mlaumcherb.Client.Avalonia.классы;
+
+namespace Mlaumcherb.Client.Avalonia.сеть.TaskFactories;
+
+public class ModpackDownloadTaskFactory : INetworkTaskFactory
+{
+    INetworkTaskFactory _implementationVersion;
+    private GameVersionDescriptor _descriptor;
+
+    public ModpackDownloadTaskFactory(GameVersionDescriptor descriptor)
+    {
+        if(descriptor.modpack is null)
+            throw new ArgumentNullException(nameof(descriptor.modpack));
+        
+        _descriptor = descriptor;
+        _implementationVersion = descriptor.modpack.format_version switch
+        {
+            1 => new MyModpackV1DownloadTaskFactory(descriptor),
+            _ => throw new Exception($"Unknown Modpack format_version: {descriptor.modpack.format_version}")
+        };
+    }
+
+    public Task<NetworkTask?> CreateAsync(bool checkHashes)
+    {
+        return _implementationVersion.CreateAsync(checkHashes);
+    }
+}

Mlaumcherb.Client.Avalonia/сеть/TaskFactories/MyModpackV1DownloadTaskFactory.cs

@@ -0,0 +1,75 @@
+using System.IO.Compression;
+using Mlaumcherb.Client.Avalonia.зримое;
+using Mlaumcherb.Client.Avalonia.классы;
+using Mlaumcherb.Client.Avalonia.холопы;
+
+namespace Mlaumcherb.Client.Avalonia.сеть.TaskFactories;
+
+public class MyModpackV1DownloadTaskFactory : INetworkTaskFactory
+{
+    private readonly GameVersionDescriptor _descriptor;
+    private IOPath _modpackDescriptorPath;
+    private IOPath _versionDir;
+    private MyModpackV1? _modpack;
+    // relative, absolute
+    private Dictionary<IOPath, IOPath> _filesToDosnload = new();
+
+    public MyModpackV1DownloadTaskFactory(GameVersionDescriptor descriptor)
+    {
+        _descriptor = descriptor;
+        _modpackDescriptorPath = PathHelper.GetModpackDescriptorPath(_descriptor.id);
+        _versionDir = PathHelper.GetVersionDir(_descriptor.id);
+    }
+    
+    public async Task<NetworkTask?> CreateAsync(bool checkHashes)
+    {
+        if(_descriptor.modpack is null)
+            throw new ArgumentNullException(nameof(_descriptor.modpack));
+        
+        (_modpack, bool didDownloadModpackDescriptor) = await NetworkHelper.ReadOrDownloadAndDeserialize<MyModpackV1>(
+            _modpackDescriptorPath,
+            _descriptor.modpack.artifact.url, 
+            _descriptor.modpack.artifact.sha1,
+            checkHashes);
+        if (_modpack.format_version != _descriptor.modpack.format_version)
+            throw new Exception($"Modpack.format_version mismatches descriptor.modpack.version: " +
+                                $"{_modpack.format_version} != {_descriptor.modpack.format_version}");
+        
+        NetworkTask? networkTask = null;
+        _filesToDosnload = _modpack.CheckFiles(_versionDir, checkHashes, didDownloadModpackDescriptor);
+        if(_filesToDosnload.Count > 0)
+        {
+            networkTask = new NetworkTask(
+                $"modpack '{_modpack.name}'",
+                _modpack.zip.size,
+                Download
+            );
+        }
+
+        return networkTask;
+    }
+
+    private async Task Download(NetworkProgressReporter pr, CancellationToken ct)
+    {
+        LauncherApp.Logger.LogInfo(nameof(NetworkHelper), $"started downloading modpack '{_modpack!.name}'");
+        if(string.IsNullOrEmpty(_modpack.zip.url))
+            throw new Exception($"modpack '{_modpack.name}' doesn't have a url to download");
+
+        var _archivePath = Path.Concat(PathHelper.GetCacheDir(), "modpacks", _modpack.name + ".zip");
+        await NetworkHelper.DownloadFile(_modpack.zip.url, _archivePath, ct, pr.AddBytesCount);
+        
+        await using var zipf = File.OpenRead(_archivePath);
+        using var archive = new ZipArchive(zipf);
+        foreach (var entry in archive.Entries)
+        {
+            IOPath relativePath = new(entry.FullName);
+            if(_filesToDosnload.TryGetValue(relativePath, out var absolutePath))
+            {
+                Directory.Create(absolutePath.ParentDir());
+                entry.ExtractToFile(absolutePath.ToString(), true);
+            }
+        }
+        
+        LauncherApp.Logger.LogInfo(nameof(NetworkHelper), $"finished downloading modpack '{_modpack.name}'");
+    }
+}

Mlaumcherb.Client.Avalonia/сеть/TaskFactories/VersionJarDownloadTaskFactory.cs

@@ -0,0 +1,55 @@
+using Mlaumcherb.Client.Avalonia.зримое;
+using Mlaumcherb.Client.Avalonia.классы;
+using Mlaumcherb.Client.Avalonia.холопы;
+using static Mlaumcherb.Client.Avalonia.сеть.NetworkHelper;
+
+namespace Mlaumcherb.Client.Avalonia.сеть.TaskFactories;
+
+public class VersionJarDownloadTaskFactory : INetworkTaskFactory
+{
+    private GameVersionDescriptor _descriptor;
+    private IOPath _filePath;
+    
+    public VersionJarDownloadTaskFactory(GameVersionDescriptor descriptor)
+    {
+        _descriptor = descriptor;
+        _filePath = PathHelper.GetVersionJarFilePath(_descriptor.id);
+    }
+
+    public Task<NetworkTask?> CreateAsync(bool checkHashes)
+    {
+        NetworkTask? networkTask = null;
+        if (!CheckFiles(checkHashes))
+        {
+            networkTask = new NetworkTask(
+                $"game version jar '{_descriptor.id}'",
+                GetTotalSize(),
+                Download
+            );
+        }
+        
+        return Task.FromResult(networkTask);
+    }
+
+    private bool CheckFiles(bool checkHashes)
+    {
+        return HashHelper.CheckFileSHA1(_filePath, _descriptor.downloads?.client.sha1, checkHashes);
+    }
+
+    private long GetTotalSize()
+    {
+        if(_descriptor.downloads is null)
+            return 0;
+        return _descriptor.downloads.client.size;
+    }
+    
+    private async Task Download(NetworkProgressReporter pr, CancellationToken ct)
+    {
+        if (_descriptor.downloads is null)
+            throw new Exception($"can't download game version jar '{_descriptor.id}' because it has no download url");
+        
+        LauncherApp.Logger.LogInfo(nameof(NetworkHelper), $"started downloading game version jar '{_descriptor.id}'");
+        await DownloadFile(_descriptor.downloads.client.url, _filePath, ct, pr.AddBytesCount);
+        LauncherApp.Logger.LogInfo(nameof(NetworkHelper), $"finished downloading game version jar '{_descriptor.id}'");
+    }
+}

Mlaumcherb.Client.Avalonia/холопы/ErrorHelper.cs

@@ -1,21 +1,21 @@
 using Avalonia.Controls;
-using DTLib.Ben.Demystifier;
-using DTLib.Logging;
+using DTLib.Demystifier;
+using Mlaumcherb.Client.Avalonia.зримое;
 using MsBox.Avalonia;
 using MsBox.Avalonia.Dto;
 using MsBox.Avalonia.Enums;
 using MsBox.Avalonia.Models;
 
-namespace Млаумчерб.Клиент;
+namespace Mlaumcherb.Client.Avalonia.холопы;
 
-public static class Ошибки
+public static class ErrorHelper
 {
-    internal static void ПоказатьСообщение(Exception err) 
-        => ПоказатьСообщение(err.ToStringDemystified());
+    internal static void ShowMessageBox(string context, Exception err) 
+        => ShowMessageBox(context, err.ToStringDemystified());
 
-    internal static async void ПоказатьСообщение(string err)
+    internal static async void ShowMessageBox(string context, string err)
     {
-        Приложение.Логгер.LogError(nameof(Ошибки), err);
+        LauncherApp.Logger.LogError(context, err);
         var box = MessageBoxManager.GetMessageBoxCustom(new MessageBoxCustomParams
             {
                 ButtonDefinitions = new List<ButtonDefinition> { new() { Name = "пон" } },

Mlaumcherb.Client.Avalonia/холопы/HashHelper.cs

@@ -0,0 +1,32 @@
+using System.Security.Cryptography;
+using DTLib.Extensions;
+
+namespace Mlaumcherb.Client.Avalonia.холопы;
+
+public static class HashHelper
+{
+    private static SHA1 _hasher;
+
+    static HashHelper()
+    {
+        _hasher = SHA1.Create();
+    }
+
+    public static string HashFileSHA1(IOPath f)
+    {
+        using var fs = File.OpenRead(f);
+        byte[] hash = _hasher.ComputeHash(fs);
+        return hash.HashToString();
+    }
+
+    public static bool CheckFileSHA1(IOPath f, string? sha1, bool checkHash)
+    {
+        if (!File.Exists(f))
+            return false;
+        
+        if(checkHash)
+            return sha1 is not null && HashFileSHA1(f) == sha1;
+
+        return true;
+    }
+}

Mlaumcherb.Client.Avalonia/холопы/LZMAHelper.cs

@@ -0,0 +1,26 @@
+namespace Mlaumcherb.Client.Avalonia.холопы;
+
+/// <summary>
+/// https://gist.github.com/ststeiger/cb9750664952f775a341
+/// </summary>
+public static class LZMAHelper
+{
+    public static void Decompress(Stream inputStream, Stream outputStream)
+    {
+        var decoder = new SevenZip.Compression.LZMA.Decoder();
+        var properties = new byte[5];
+        // Read decoder properties
+        if (inputStream.Read(properties, 0, 5) != 5)
+            throw new Exception("lzma stream is too short");
+        decoder.SetDecoderProperties(properties);
+        
+        // Read decompressed data size
+        var fileLengthBytes = new byte[8];
+        if(inputStream.Read(fileLengthBytes, 0, 8) != 8)
+            throw new Exception("lzma stream is too short");
+        long fileLength = BitConverter.ToInt64(fileLengthBytes, 0);
+        
+        // Decode
+        decoder.Code(inputStream, outputStream, -1, fileLength, null);
+    }
+}

Mlaumcherb.Client.Avalonia/холопы/PathHelper.cs

@@ -0,0 +1,65 @@
+using Mlaumcherb.Client.Avalonia.зримое;
+
+namespace Mlaumcherb.Client.Avalonia.холопы;
+
+public static class PathHelper
+{
+    public static IOPath GetRootFullPath() =>
+        System.IO.Path.GetFullPath(new IOPath(LauncherApp.Config.minecraft_dir).ToString());
+    
+    public static IOPath GetAssetsDir() => 
+        Path.Concat(GetRootFullPath(), "assets");
+    
+    public static IOPath GetAssetIndexFilePath(string id) => 
+        Path.Concat(GetAssetsDir(), $"indexes/{id}.json"); // this path is hardcoded in the game
+    
+    public static IOPath GetVersionDescriptorPath(string id) => 
+        Path.Concat(GetVersionDir(id), id + ".json");
+
+    public static IOPath GetVersionsDir() => 
+        Path.Concat(GetRootFullPath(), "versions");
+    
+    public static IOPath GetVersionDir(string id) => 
+        Path.Concat(GetVersionsDir(), id);
+
+    public static IOPath GetVersionJarFilePath(string id) =>
+        Path.Concat(GetVersionDir(id), id + ".jar");
+    
+    public static IOPath GetLibrariesDir() => 
+        Path.Concat(GetRootFullPath(), "libraries");
+
+    public static IOPath GetNativeLibrariesDir(string id) =>
+        Path.Concat(GetVersionDir(id), "natives", PlatformHelper.GetOsAndArch());
+    
+    public static IOPath GetJavaRuntimesDir() => 
+        Path.Concat(GetRootFullPath(), "java");
+    
+    
+    public static IOPath GetJavaRuntimeDir(string id) => 
+        Path.Concat(GetJavaRuntimesDir(), PlatformHelper.GetOsAndArch(), id);
+
+    public static IOPath GetJavaBinDir(string id) =>
+        Path.Concat(GetJavaRuntimeDir(id), "bin");
+    public static IOPath GetJavaExecutablePath(string id, bool debug)
+    {
+        string executable_name = "java";
+        if (debug)
+            executable_name += "w";
+        if(OperatingSystem.IsWindows())
+            executable_name += ".exe";
+        return Path.Concat(GetJavaBinDir(id), executable_name);
+    }
+
+    public static string GetLog4jConfigFileName() => "log4j.xml";
+    
+    public static IOPath GetLog4jConfigFilePath() =>
+        Path.Concat(GetAssetsDir(), GetLog4jConfigFileName());
+
+    public static IOPath GetModpackDescriptorPath(string game_version) => 
+        Path.Concat(GetVersionDir(game_version), "timerix_modpack.json");
+
+    public static IOPath GetCacheDir() =>
+        Path.Concat(GetRootFullPath(), "cache");
+    public static IOPath GetInstalledVersionCatalogPath() =>
+        Path.Concat(GetCacheDir(), "installed_versions.json");
+}

Mlaumcherb.Client.Avalonia/холопы/PlatformHelper.cs

@@ -0,0 +1,55 @@
+using System.Runtime.InteropServices;
+using Mlaumcherb.Client.Avalonia.классы;
+
+// ReSharper disable CollectionNeverUpdated.Global
+
+namespace Mlaumcherb.Client.Avalonia.холопы;
+
+public static class PlatformHelper
+{
+    public static bool CheckOs(Os os) =>
+        os.name switch
+        {
+            null => true,
+            "osx" => OperatingSystem.IsMacOS(),
+            "linux" => OperatingSystem.IsLinux(),
+            "windows" => OperatingSystem.IsWindows(),
+            _ => throw new ArgumentOutOfRangeException(os.name)
+        }
+        && os.arch switch
+        {
+            null => true,
+            "i386" or "x86" => RuntimeInformation.OSArchitecture == Architecture.X86,
+            "x64" => RuntimeInformation.OSArchitecture == Architecture.X64,
+            "arm64" => RuntimeInformation.OSArchitecture == Architecture.Arm64,
+            _ => false
+        };
+
+    public static string GetOs() =>
+        Environment.OSVersion.Platform switch
+        {
+            PlatformID.Win32NT => "windows",
+            PlatformID.Unix => "linux",
+            PlatformID.MacOSX => "osx",
+            _ => throw new PlatformNotSupportedException("OS not supported")
+        };
+    
+    public static string GetArch() =>
+        RuntimeInformation.OSArchitecture switch
+        {
+            Architecture.X86 => "x86",
+            Architecture.X64 => "x64",
+            Architecture.Arm64 => "arm64",
+            _ => throw new PlatformNotSupportedException("OS not supported")
+        };
+    
+    public static string GetArchOld() =>
+        RuntimeInformation.OSArchitecture switch
+        {
+            Architecture.X86 => "32",
+            Architecture.X64 => "64",
+            _ => throw new PlatformNotSupportedException("OS not supported")
+        };
+
+    public static string GetOsAndArch() => GetOs() + '-' + GetArch();
+}

Mlaumcherb.Client.Avalonia/холопы/ReverseComparer.cs

@@ -0,0 +1,12 @@
+namespace Mlaumcherb.Client.Avalonia.холопы;
+
+// compares Y with X instead of X with Y
+public class ReverseComparer<T> : IComparer<T> where T : IComparable<T>
+{
+    public int Compare(T? x, T? y)
+    {
+        if (y is null)
+            return x is null ? 0 : -1;
+        return y.CompareTo(x);
+    }
+}

mlaumcherb.sln

@@ -0,0 +1,21 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Mlaumcherb.Client.Avalonia", "Mlaumcherb.Client.Avalonia\Mlaumcherb.Client.Avalonia.csproj", "{9B9D8B05-255F-49C3-89EC-3F43A66491D3}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "SolutionFolder", "SolutionFolder", "{A3217C18-CC0D-4CE8-9C48-1BDEC1E1B333}"
+	ProjectSection(SolutionItems) = preProject
+		.gitignore = .gitignore
+	EndProjectSection
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Release|x64 = Release|x64
+		Debug|x64 = Debug|x64
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{9B9D8B05-255F-49C3-89EC-3F43A66491D3}.Release|x64.ActiveCfg = Release|x64
+		{9B9D8B05-255F-49C3-89EC-3F43A66491D3}.Release|x64.Build.0 = Release|x64
+		{9B9D8B05-255F-49C3-89EC-3F43A66491D3}.Debug|x64.ActiveCfg = Debug|x64
+		{9B9D8B05-255F-49C3-89EC-3F43A66491D3}.Debug|x64.Build.0 = Debug|x64
+	EndGlobalSection
+EndGlobal

Млаумчерб.Клиент/LauncherLogger.cs

@@ -1,13 +0,0 @@
-using DTLib.Filesystem;
-using DTLib.Logging;
-
-namespace Млаумчерб.Клиент;
-
-public class LauncherLogger : FileLogger
-{
-    public static readonly IOPath LogsDirectory = "launcher-logs";
-    
-    public LauncherLogger() : base(LogsDirectory, "млаумчерб")
-    {
-    }
-}

Млаумчерб.Клиент/Network.cs

@@ -1,13 +0,0 @@
-namespace Млаумчерб.Клиент;
-
-public record struct NetworkTransferResult
-{
-    public long BytesTotal;
-    public long BytesTransferred;
-    public long BytesPerSecond;
-}
-
-public class NetworkHelper
-{
-    
-}

Млаумчерб.Клиент/Главне.cs

@@ -1,29 +0,0 @@
-global using System;
-global using System.Collections.Generic;
-global using System.IO;
-global using System.Text;
-global using DTLib.Logging;
-global using DTLib.Filesystem;
-global using File = DTLib.Filesystem.File;
-global using Directory = DTLib.Filesystem.Directory;
-using System.Globalization;
-using Avalonia;
-
-namespace Млаумчерб.Клиент;
-
-public class Главне
-{
-    [STAThread]
-    public static void Main(string[] args)
-    {
-        CultureInfo.DefaultThreadCurrentCulture = CultureInfo.InvariantCulture;
-        BuildAvaloniaApp()
-            .StartWithClassicDesktopLifetime(args);
-    }
-
-    // Avalonia configuration, don't remove; also used by visual designer.
-    public static AppBuilder BuildAvaloniaApp()
-        => AppBuilder.Configure<Приложение>()
-            .UsePlatformDetect()
-            .LogToTrace();
-}

Млаумчерб.Клиент/Игра.cs

@@ -1,41 +0,0 @@
-using System.Threading.Tasks;
-using DTLib.Filesystem;
-using Path = DTLib.Filesystem.Path;
-
-namespace Млаумчерб.Клиент;
-
-public interface IGame
-{
-    string Name { get; }
-    IOPath InstallationDirectory { get; }
-    Progress<NetworkTransferResult> BeginUpdate();
-    void EndUpdate();
-    Task Launch();
-}
-
-public class MinecraftVersion : IGame
-{
-    public string Name { get; }
-    public IOPath InstallationDirectory { get; }
-
-    public MinecraftVersion(string name)
-    {
-        Name = name;
-        InstallationDirectory = Path.Concat("minecraft", Path.ReplaceRestrictedChars(name));
-    }
-    
-    public Progress<NetworkTransferResult> BeginUpdate()
-    {
-        throw new NotImplementedException();
-    }
-
-    public void EndUpdate()
-    {
-        throw new NotImplementedException();
-    }
-
-    public Task Launch()
-    {
-        throw new NotImplementedException();
-    }
-}

Млаумчерб.Клиент/Настройки.cs

@@ -1,44 +0,0 @@
-using DTLib.Logging;
-using Newtonsoft.Json;
-
-namespace Млаумчерб.Клиент;
-
-public record Настройки
-{
-    public string имя_пользователя { get; set; } = "";
-    public int выделенная_память_мб { get; set; } = 4096;
-    public bool открывать_на_весь_экран { get; set; }
-
-    public static Настройки ЗагрузитьИзФайла(string имя_файла = "млаумчерб.настройки")
-    {
-        Приложение.Логгер.LogInfo(nameof(Настройки), $"попытка загрузить настройки из файла '{имя_файла}'");
-        if(!File.Exists(имя_файла))
-        {
-            Приложение.Логгер.LogInfo(nameof(Настройки), "файл не существует");
-            return new Настройки();
-        }
-
-        string текст = File.ReadAllText(имя_файла);
-        Настройки? н = JsonConvert.DeserializeObject<Настройки>(текст);
-        if (н == null)
-        {
-            File.Move(имя_файла, имя_файла + ".старые", true);
-            н = new Настройки();
-            н.СохранитьВФайл();
-            Ошибки.ПоказатьСообщение($"Не удалось прочитать настройки.\n" +
-                     $"Сломанный файл настроек переименован в '{имя_файла}.старые'.\n" +
-                     $"Создан новый файл '{имя_файла}'.");
-        }
-
-        Приложение.Логгер.LogInfo(nameof(Настройки), $"настройки загружены: {н}");
-        return н;
-    }
-
-    public void СохранитьВФайл(string имя_файла = "млаумчерб.настройки")
-    {
-        Приложение.Логгер.LogInfo(nameof(Настройки), $"попытка сохранить настройки в файл '{имя_файла}'");
-        var текст = JsonConvert.SerializeObject(this, Formatting.Indented);
-        File.WriteAllText(имя_файла, текст);
-        Приложение.Логгер.LogInfo(nameof(Настройки), $"настройки сохранены: {текст}");
-    }
-}

Млаумчерб.Клиент/Окне.axaml

@@ -1,106 +0,0 @@
-<Window xmlns="https://github.com/avaloniaui"
-        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-        xmlns:gif="clr-namespace:Avalonia.Gif;assembly=Avalonia.Gif"
-        xmlns:local="clr-namespace:Млаумчерб"
-        x:Class="Млаумчерб.Клиент.Окне"
-        Name="window"
-        Title="млаумчерб"
-        Icon="avares://млаумчерб/капитал/кубе.ico"
-        FontFamily="{StaticResource PlexMono}" FontSize="18"
-        MinWidth="800" MinHeight="500"
-        Width="800" Height="500"
-        WindowStartupLocation="CenterScreen">
-    <Grid>
-        <Grid.RowDefinitions>* 30</Grid.RowDefinitions>
-        <Image Grid.RowSpan="2" Stretch="UniformToFill"
-               Source="avares://млаумчерб/капитал/фоне.png"/>
-        
-        <Grid Grid.Row="0" Margin="10">
-            <Grid.ColumnDefinitions>* 300 *</Grid.ColumnDefinitions>
-            <Border Grid.Column="0" 
-                    Classes="dark_tr_bg white_border">
-                <Grid>
-                    <Grid.RowDefinitions>30 *</Grid.RowDefinitions>
-                    <Border Classes="white_border" Margin="-1" Padding="4">
-                        <TextBlock FontWeight="Bold" 
-                                   HorizontalAlignment="Center" 
-                                   VerticalAlignment="Center">
-                            News
-                        </TextBlock>
-                    </Border>
-                </Grid>
-            </Border>
-            <Border Grid.Column="1" 
-                    Classes="dark_tr_bg white_border"
-                    Margin="10 0">
-                <Grid>
-                    <Grid.RowDefinitions>* 60</Grid.RowDefinitions>
-                    <StackPanel Orientation="Vertical" Margin="10" Spacing="10">
-                        <TextBlock>Version:</TextBlock>
-                        <ComboBox Name="VersionComboBox">
-                            
-                        </ComboBox>
-                        
-                        <TextBlock>Username:</TextBlock>
-                        <TextBox Text="{Binding #window.Username}"></TextBox>
-                        
-                        <TextBlock>
-                            <Run>Memory limit:</Run>
-                            <TextBox Background="Transparent" Padding="0"
-                                     BorderThickness="1"
-                                     BorderBrush="#777777"
-                                     Text="{Binding #window.MemoryLimit}">
-                            </TextBox>
-                            <Run>Mb</Run>
-                        </TextBlock>
-                        <Slider Minimum="2048" Maximum="8192"
-                                Value="{Binding #window.MemoryLimit}">
-                        </Slider>
-                        
-                        <CheckBox IsChecked="{Binding #window.Fullscreen}">
-                            Fullscreen
-                        </CheckBox>
-                        
-                        <CheckBox IsChecked="{Binding #window.UpdateGameFiles}">
-                            Update game files
-                        </CheckBox>
-                    </StackPanel>
-                    <Button Grid.Row="1" Margin="10" Padding="0 0 0 4"
-                            Classes="button_no_border"
-                            Background="#BBFF5900"
-                            Click="LaunchButtonHandler">
-                        Launch
-                    </Button>
-                </Grid>
-            </Border>
-            
-            <Border Grid.Column="2" Classes="dark_tr_bg white_border">
-                <Grid>
-                    <Grid.RowDefinitions>30 *</Grid.RowDefinitions>
-                    <Border Classes="white_border" Margin="-1" Padding="4">
-                        <TextBlock FontWeight="Bold" 
-                                   HorizontalAlignment="Center" 
-                                   VerticalAlignment="Center">
-                            Downloads
-                        </TextBlock>
-                    </Border>
-                </Grid>
-            </Border>
-        </Grid>
-        <Border Grid.Row="1" Background="#6f4808B0">
-            <Grid>
-                <StackPanel Orientation="Horizontal" HorizontalAlignment="Left">
-                    <Button Classes="menu_button button_no_border" Click="OpenLogsDirectory">logs directory</Button>
-                    <Border Classes="menu_separator"></Border>
-                    <Button Classes="menu_button button_no_border" Click="OpenLogFile">log file</Button>
-                </StackPanel>
-                <StackPanel Orientation="Horizontal" HorizontalAlignment="Right">
-                    <Button Classes="menu_button button_no_border" Click="OpenSourceRepository">source code</Button>
-                    <gif:GifImage 
-                        Width="30" Height="30" Stretch="Uniform"
-                        SourceUri="avares://млаумчерб/капитал/лисик.gif"/>
-                </StackPanel>
-            </Grid>
-        </Border>
-    </Grid>
-</Window>

Млаумчерб.Клиент/Окне.axaml.cs

@@ -1,97 +0,0 @@
-using Avalonia;
-using Avalonia.Controls;
-using Avalonia.Data;
-using Avalonia.Interactivity;
-using Avalonia.Platform.Storage;
-
-namespace Млаумчерб.Клиент;
-
-public partial class Окне : Window
-{
-    public static readonly StyledProperty<string> UsernameProperty =
-        AvaloniaProperty.Register<Окне, string>(nameof(Username),
-            defaultBindingMode: BindingMode.TwoWay);
-    public string Username
-    {
-        get => GetValue(UsernameProperty);
-        set => SetValue(UsernameProperty, value);
-    }
-    
-    public static readonly StyledProperty<int> MemoryLimitProperty =
-        AvaloniaProperty.Register<Окне, int>(nameof(MemoryLimit),
-            defaultBindingMode: BindingMode.TwoWay, defaultValue: 2048);
-    public int MemoryLimit
-    {
-        get => GetValue(MemoryLimitProperty);
-        set => SetValue(MemoryLimitProperty, value);
-    }
-
-    public static readonly StyledProperty<bool> FullscreenProperty =
-        AvaloniaProperty.Register<Окне, bool>(nameof(Fullscreen),
-            defaultBindingMode: BindingMode.TwoWay, defaultValue: false);
-    public bool Fullscreen
-    {
-        get => GetValue(FullscreenProperty);
-        set => SetValue(FullscreenProperty, value);
-    }
-    
-    public static readonly StyledProperty<bool> UpdateGameFilesProperty =
-        AvaloniaProperty.Register<Окне, bool>(nameof(UpdateGameFiles),
-            defaultBindingMode: BindingMode.TwoWay, defaultValue: true);
-    public bool UpdateGameFiles
-    {
-        get => GetValue(UpdateGameFilesProperty);
-        set => SetValue(UpdateGameFilesProperty, value);
-    }
-    
-    public Окне()
-    {
-        InitializeComponent();
-    }
-    
-    protected override void OnLoaded(RoutedEventArgs e)
-    {
-        try
-        {
-            Приложение.Настройки = Настройки.ЗагрузитьИзФайла();
-            Username = Приложение.Настройки.имя_пользователя;
-            MemoryLimit = Приложение.Настройки.выделенная_память_мб;
-            Fullscreen = Приложение.Настройки.открывать_на_весь_экран;
-        }
-        catch (Exception ex)
-        {
-            Ошибки.ПоказатьСообщение(ex);
-        }
-    }
-
-    private void LaunchButtonHandler(object? sender, RoutedEventArgs e)
-    {
-        try
-        {
-            Приложение.Настройки.имя_пользователя = Username;
-            Приложение.Настройки.выделенная_память_мб = MemoryLimit;
-            Приложение.Настройки.открывать_на_весь_экран = Fullscreen;
-            Приложение.Настройки.СохранитьВФайл();
-            
-        }
-        catch (Exception ex)
-        {
-            Ошибки.ПоказатьСообщение(ex);
-        }
-    }
-
-    private void OpenLogsDirectory(object? s, RoutedEventArgs e)
-    {
-        Launcher.LaunchDirectoryInfoAsync(new DirectoryInfo(LauncherLogger.LogsDirectory.ToString()));
-    }
-    
-    private void OpenLogFile(object? sender, RoutedEventArgs e)
-    {
-        Launcher.LaunchFileInfoAsync(new FileInfo(Приложение.Логгер.LogfileName.ToString()));
-    }
-
-    private void OpenSourceRepository(object? sender, RoutedEventArgs e)
-    {
-        Launcher.LaunchUriAsync(new Uri("https://timerix.ddns.net:3322/Timerix/mlaumcherb"));
-    }
-}

Млаумчерб.Клиент/Приложение.axaml

@@ -1,38 +0,0 @@
-<Application xmlns="https://github.com/avaloniaui"
-             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-             x:Class="Млаумчерб.Клиент.Приложение"
-             RequestedThemeVariant="Dark">
-    <Application.Styles>
-        <SimpleTheme />
-        
-        <Style Selector="Border.dark_tr_bg">
-            <Setter Property="Background" Value="#b7303040"/>
-        </Style>
-        
-        <Style Selector="Border.white_border">
-            <Setter Property="BorderThickness" Value="1"/>
-            <Setter Property="BorderBrush" Value="White"/>
-        </Style>
-        
-        <Style Selector="Button.button_no_border">
-            <Setter Property="BorderThickness" Value="1"/>
-            <Setter Property="BorderBrush" Value="Transparent"/>
-        </Style>
-        
-        <Style Selector="Button.menu_button">
-            <Setter Property="Background" Value="Transparent"/>
-            <Setter Property="Padding" Value="4 0"/>
-            <Setter Property="MinWidth" Value="50"/>
-        </Style>
-        
-        <Style Selector="Border.menu_separator">
-            <Setter Property="Background" Value="#ff505050"/>
-            <Setter Property="Width" Value="1"/>
-            <Setter Property="Margin" Value="4"/>
-        </Style>
-    </Application.Styles>
-    
-    <Application.Resources>
-        <FontFamily x:Key="PlexMono">avares://млаумчерб/капитал/IBMPlexMono-Regular.ttf</FontFamily>
-    </Application.Resources>
-</Application>

Млаумчерб.Клиент/Приложение.axaml.cs

@@ -1,28 +0,0 @@
-using Avalonia;
-using Avalonia.Controls.ApplicationLifetimes;
-using Avalonia.Markup.Xaml;
-
-namespace Млаумчерб.Клиент;
-
-public class Приложение : Application
-{
-    public static readonly LauncherLogger Логгер = new();
-    
-    public override void Initialize()
-    {
-        Логгер.LogInfo(nameof(Приложение), "приложение запущено");
-        AvaloniaXamlLoader.Load(this);
-    }
-
-    public override void OnFrameworkInitializationCompleted()
-    {
-        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
-        {
-            desktop.MainWindow = new Окне();
-        }
-
-        base.OnFrameworkInitializationCompleted();
-    }
-
-    public static Настройки Настройки = new();
-}

Млаумчерб.Клиент/классы/Буржуазия.cs

@@ -1,98 +0,0 @@
-using Newtonsoft.Json;
-
-namespace Млаумчерб.Клиент.классы;
-
-public class Artifact
-{
-    [JsonRequired] public string url { get; set; } = "";
-    [JsonRequired] public string sha1 { get; set; } = "";
-    [JsonRequired] public int size { get; set; }
-}
-
-public class Os
-{
-    [JsonRequired] public string name { get; set; } = "";
-}
-
-public class Rule
-{
-    [JsonRequired] public string action { get; set; } = "";
-    [JsonRequired] public Os os { get; set; } = null!;
-}
-
-public class Classifiers
-{
-    [JsonProperty("natives-linux")]
-    public Artifact? nativeslinux { get; set; }
-    
-    [JsonProperty("natives-osx")]
-    public Artifact? nativesosx { get; set; }
-    
-    [JsonProperty("natives-windows")]
-    public Artifact? nativeswindows { get; set; }
-}
-
-public class LibraryDownloads
-{
-    public Artifact? artifact { get; set; }
-    public Classifiers? classifiers { get; set; }
-}
-
-public class Extract
-{
-    public List<string>? exclude { get; set; }
-}
-
-public class Natives
-{
-    public string? linux { get; set; }
-    public string? osx { get; set; }
-    public string? windows { get; set; }
-}
-
-public class Library
-{
-    [JsonRequired] public string name { get; set; } = "";
-    public List<Rule>? rules { get; set; }
-    public Natives? natives { get; set; }
-    public Extract? extract { get; set; }
-    [JsonRequired] public LibraryDownloads downloads { get; set; } = null!;
-}
-
-public class AssetIndex
-{
-    [JsonRequired] public string id { get; set; } = "";
-    [JsonRequired] public int totalSize { get; set; }
-    [JsonRequired] public bool known { get; set; }
-    [JsonRequired] public string url { get; set; } = "";
-    [JsonRequired] public string sha1 { get; set; } = "";
-    [JsonRequired] public int size { get; set; }
-}
-
-public class Downloads
-{
-    [JsonRequired] public Artifact client { get; set; } = null!;
-}
-
-public class JavaVersion
-{
-    [JsonRequired] public string component { get; set; } = "";
-    [JsonRequired] public int majorVersion { get; set; }
-}
-
-public class MinecraftVersionDescriptor
-{
-    [JsonRequired] public string id { get; set; } = "";
-    [JsonRequired] public string jar { get; set; } = "";
-    [JsonRequired] public string family { get; set; } = "";
-    [JsonRequired] public DateTime time { get; set; }
-    [JsonRequired] public DateTime releaseTime { get; set; }
-    [JsonRequired] public string type { get; set; } = "";
-    [JsonRequired] public string mainClass { get; set; } = "";
-    [JsonRequired] public Downloads downloads { get; set; } = null!;
-    [JsonRequired] public JavaVersion javaVersion { get; set; } = null!;
-    [JsonRequired] public List<Library> libraries { get; set; } = null!;
-    [JsonRequired] public AssetIndex assetIndex { get; set; } = null!;
-    [JsonRequired] public string assets { get; set; } = "";
-    // public string minecraftArguments { get; set; }
-}

Млаумчерб.Клиент/классы/Пролетариат.cs

@@ -1,6 +0,0 @@
-namespace Млаумчерб.Клиент.классы;
-
-public class Пролетариат
-{
-    
-}

млаумчерб.sln

@@ -1,16 +0,0 @@
-
-Microsoft Visual Studio Solution File, Format Version 12.00
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Млаумчерб.Клиент", "Млаумчерб.Клиент\Млаумчерб.Клиент.csproj", "{9B9D8B05-255F-49C3-89EC-3F43A66491D3}"
-EndProject
-Global
-	GlobalSection(SolutionConfigurationPlatforms) = preSolution
-		Debug|Any CPU = Debug|Any CPU
-		Release|Any CPU = Release|Any CPU
-	EndGlobalSection
-	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{9B9D8B05-255F-49C3-89EC-3F43A66491D3}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{9B9D8B05-255F-49C3-89EC-3F43A66491D3}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{9B9D8B05-255F-49C3-89EC-3F43A66491D3}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{9B9D8B05-255F-49C3-89EC-3F43A66491D3}.Release|Any CPU.Build.0 = Release|Any CPU
-	EndGlobalSection
-EndGlobal