diff --git a/Млаумчерб.Клиент/Network.cs b/Млаумчерб.Клиент/Network.cs
index 15f9f0d..47133e1 100644
--- a/Млаумчерб.Клиент/Network.cs
+++ b/Млаумчерб.Клиент/Network.cs
@@ -1,13 +1,72 @@
-namespace Млаумчерб.Клиент;
+using System.Net.Http;
+using System.Runtime.CompilerServices;
+using System.Threading;
+using System.Threading.Tasks;
 
-public record struct NetworkTransferResult
+namespace Млаумчерб.Клиент;
+
+public record struct NetworkTransferResult(long BytesTotal, long BytesTransferred, long BytesPerSecond)
 {
-    public long BytesTotal;
-    public long BytesTransferred;
-    public long BytesPerSecond;
+    public override string ToString()
+    {
+        return $"transferred {BytesTransferred}/{BytesTotal} bytes ({BytesPerSecond}) bps";
+    }
 }
 
-public class NetworkHelper
+public class NetworkTransferTask
 {
+    public Task Task { get; private set; }
+    public Progress<NetworkTransferResult> Progress { get; private set; }
+
+    private Stream _src;
+    private Stream _dst;
+    private CancellationTokenSource _cts;
+    private DTLib.Timer _timer;
     
+    public NetworkTransferTask(Stream src, Stream dst)
+    {
+        _src = src;
+        _dst = dst;
+        _cts = new CancellationTokenSource();
+        Progress = new Progress<NetworkTransferResult>();
+        _timer = new(true, 1000, ReportProgress);
+        Task = Task.CompletedTask;
+    }
+
+    public void Start()
+    {
+        _timer.Start();
+        Task = _src.CopyToAsync(_dst);
+        _timer.Stop();
+    }
+
+    public void Stop()
+    {
+        _cts.Cancel();
+        _timer.Stop();
+    }
+
+    private long previousBytesTransferred;
+    private void ReportProgress()
+    {
+        long bytesTotal = _src.Length, bytesTransferred = _src.Position;
+        long bytesPerSecond = bytesTransferred - previousBytesTransferred;
+        previousBytesTransferred = bytesTransferred;
+        ((IProgress<NetworkTransferResult>)Progress).Report(new NetworkTransferResult(bytesTotal, bytesTransferred, bytesPerSecond));
+    }
+    
+    public TaskAwaiter GetAwaiter() => Task.GetAwaiter();
+}
+
+public static class NetworkHelper
+{
+    private static HttpClient http = new();
+
+    public static NetworkTransferTask DownloadHTTPFileAsync(string url, Stream destinationStream)
+    {
+        var sourceStream = http.GetStreamAsync(url).GetAwaiter().GetResult();
+        NetworkTransferTask task = new(sourceStream, destinationStream);
+        task.Start();
+        return task;
+    }
 }
\ No newline at end of file
diff --git a/Млаумчерб.Клиент/Игра.cs b/Млаумчерб.Клиент/Игра.cs
index b21d01a..646470f 100644
--- a/Млаумчерб.Клиент/Игра.cs
+++ b/Млаумчерб.Клиент/Игра.cs
@@ -2,6 +2,7 @@
 using System.Threading.Tasks;
 using CliWrap;
 using DTLib.Extensions;
+using Newtonsoft.Json;
 using Млаумчерб.Клиент.классы;
 
 namespace Млаумчерб.Клиент;
@@ -11,7 +12,7 @@ public interface IGame
     string Name { get; }
     IOPath InstallationDirectory { get; }
     Progress<NetworkTransferResult> BeginUpdate();
-    void EndUpdate();
+    void CancelUpdate();
     Task Launch();
     void Close();
 }
@@ -21,17 +22,25 @@ public class MinecraftVersion : IGame
     public string Name { get; }
     public IOPath InstallationDirectory { get; }
 
-    private IOPath JavawFilePath;
+    private IOPath JavaExecutableFilePath;
 
+    private MinecraftVersionDescriptor descriptor;
     private JavaArguments javaArgs;
     private GameArguments gameArgs;
     private CancellationTokenSource? cts;
-    private CommandTask<CommandResult> commandTask;
+    private CommandTask<CommandResult>? commandTask;
     
-    public MinecraftVersion(string name)
+    public MinecraftVersion(IOPath descriptorFilePath)
     {
-        Name = name;
-        InstallationDirectory = Path.Concat("minecraft", Path.ReplaceRestrictedChars(name));
+        Name = descriptorFilePath.LastName().ToString().Replace(".json", "");
+        InstallationDirectory =  Path.Concat(Приложение.Настройки.путь_к_кубачу, Name);
+        string descriptorText = File.ReadAllText(descriptorFilePath);
+        descriptor = JsonConvert.DeserializeObject<MinecraftVersionDescriptor>(descriptorText) 
+            ?? throw new Exception($"can't parse descriptor file '{descriptorFilePath}'");
+        javaArgs = new JavaArguments(descriptor);
+        gameArgs = new GameArguments(descriptor);
+        JavaExecutableFilePath = Path.Concat(Приложение.Настройки.путь_к_жабе, "bin",
+            OperatingSystem.IsWindows() ? "javaw.exe" : "javaw");
     }
     
     public Progress<NetworkTransferResult> BeginUpdate()
@@ -39,7 +48,7 @@ public class MinecraftVersion : IGame
         throw new NotImplementedException();
     }
 
-    public void EndUpdate()
+    public void CancelUpdate()
     {
         throw new NotImplementedException();
     }
@@ -48,7 +57,7 @@ public class MinecraftVersion : IGame
     {
         var javaArgsList = javaArgs.FillPlaceholders([]);
         var gameArgsList = gameArgs.FillPlaceholders([]);
-        var command = Cli.Wrap(JavawFilePath.ToString())
+        var command = Cli.Wrap(JavaExecutableFilePath.ToString())
             .WithWorkingDirectory(InstallationDirectory.ToString())
             .WithArguments(javaArgsList)
             .WithArguments(gameArgsList);
@@ -68,4 +77,6 @@ public class MinecraftVersion : IGame
     {
         cts?.Cancel();
     }
+
+    public override string ToString() => Name;
 }
\ No newline at end of file
diff --git a/Млаумчерб.Клиент/Млаумчерб.Клиент.csproj b/Млаумчерб.Клиент/Млаумчерб.Клиент.csproj
index b37c20e..35d6ae5 100644
--- a/Млаумчерб.Клиент/Млаумчерб.Клиент.csproj
+++ b/Млаумчерб.Клиент/Млаумчерб.Клиент.csproj
@@ -18,11 +18,8 @@
         <PackageReference Include="Avalonia.Themes.Simple" Version="11.*" />
         <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="11.*" />
         <PackageReference Include="Avalonia.Labs.Gif" Version="11.2.999-cibuild-00051673"/>
-        <PackageReference Include="CliWrap" Version="3.6.6" />
-        <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="CliWrap" Version="3.6.*" />
+        <PackageReference Include="DTLib" Version="1.4.0" />
         <PackageReference Include="MessageBox.Avalonia" Version="3.1.*" />
         <PackageReference Include="Newtonsoft.Json" Version="13.*" />
     </ItemGroup>
diff --git a/Млаумчерб.Клиент/Настройки.cs b/Млаумчерб.Клиент/Настройки.cs
index b30f30a..5659b0d 100644
--- a/Млаумчерб.Клиент/Настройки.cs
+++ b/Млаумчерб.Клиент/Настройки.cs
@@ -7,7 +7,10 @@ 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 string путь_к_кубачу { get; set; } = ".";
+    public string путь_к_жабе { get; set; } = "java";
+    public bool скачать_жабу { get; set; } = true;
+    
     public static Настройки ЗагрузитьИзФайла(string имя_файла = "млаумчерб.настройки")
     {
         Приложение.Логгер.LogInfo(nameof(Настройки), $"попытка загрузить настройки из файла '{имя_файла}'");
diff --git a/Млаумчерб.Клиент/Окне.axaml.cs b/Млаумчерб.Клиент/Окне.axaml.cs
index 3511493..3424cae 100644
--- a/Млаумчерб.Клиент/Окне.axaml.cs
+++ b/Млаумчерб.Клиент/Окне.axaml.cs
@@ -57,6 +57,15 @@ public partial class Окне : Window
             Username = Приложение.Настройки.имя_пользователя;
             MemoryLimit = Приложение.Настройки.выделенная_память_мб;
             Fullscreen = Приложение.Настройки.открывать_на_весь_экран;
+
+            IOPath localDescriptorsDir = Path.Concat(Приложение.Настройки.путь_к_кубачу, "version_descriptors");
+            Directory.Create(localDescriptorsDir);
+            var descriptorFiles = Directory.GetFiles(localDescriptorsDir);
+            foreach(var descriptorFile in descriptorFiles)
+            {
+                MinecraftVersion mc = new(descriptorFile);
+                VersionComboBox.Items.Add(mc);
+            }
         }
         catch (Exception ex)
         {
@@ -72,7 +81,16 @@ public partial class Окне : Window
             Приложение.Настройки.выделенная_память_мб = MemoryLimit;
             Приложение.Настройки.открывать_на_весь_экран = Fullscreen;
             Приложение.Настройки.СохранитьВФайл();
-            
+
+            IGame? game = (IGame?)VersionComboBox.SelectionBoxItem;
+            if (game != null)
+            {
+                if (UpdateGameFiles)
+                {
+                    var progress = game.BeginUpdate();
+                    progress.ProgressChanged += (o, result) => Приложение.Логгер.LogDebug("Downloads", result);
+                }
+            }
         }
         catch (Exception ex)
         {