now it works

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

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+namespace Mlaumcherb.Client.Avalonia.классы;
+
+public class GameVersionCatalog
+{
+    [JsonRequired] public List<RemoteVersionDescriptorProps> versions { get; set; } = null!;
+}
+
+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 type { get; set; } = "";
+    [JsonRequired] public string url { get; set; } = "";
+    [JsonRequired] public string sha1 { get; set; } = "";
+    [JsonRequired] public DateTime time { get; set; }
+    [JsonRequired] public DateTime releaseTime { get; set; }
+}

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

@@ -0,0 +1,114 @@
+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 Downloads downloads { get; set; } = null!;
+    [JsonRequired] public List<Library> libraries { get; set; } = null!;
+    [JsonRequired] public AssetIndexProperties assetIndex { get; set; } = null!;
+    [JsonRequired] public string assets { get; set; } = "";
+    public JavaVersion javaVersion { get; set; } = new() { component = "jre-legacy", majorVersion = 8 };
+    public string? minecraftArguments { get; set; }
+    public ArgumentsNew? arguments { get; set; }
+}
+
+public class Artifact
+{
+    [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

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+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; } = null!;
+}
+
+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;
+    }
+}