diff --git a/Mlaumcherb.Client.Avalonia/классы/Буржуазия/GameVersionDescriptor.cs b/Mlaumcherb.Client.Avalonia/классы/Буржуазия/GameVersionDescriptor.cs
index 3d67d3f..580109d 100644
--- a/Mlaumcherb.Client.Avalonia/классы/Буржуазия/GameVersionDescriptor.cs
+++ b/Mlaumcherb.Client.Avalonia/классы/Буржуазия/GameVersionDescriptor.cs
@@ -67,7 +67,7 @@ public class Library
     public List<Rule>? rules { get; set; }
     public Natives? natives { get; set; }
     public Extract? extract { get; set; }
-    [JsonRequired] public LibraryDownloads downloads { get; set; } = null!;
+    public LibraryDownloads? downloads { get; set; }
 }
 
 public class AssetIndexProperties
diff --git a/Mlaumcherb.Client.Avalonia/классы/Пролетариат/InstalledGameVersionProps.cs b/Mlaumcherb.Client.Avalonia/классы/Пролетариат/InstalledGameVersionProps.cs
index 5456a4a..06b7302 100644
--- a/Mlaumcherb.Client.Avalonia/классы/Пролетариат/InstalledGameVersionProps.cs
+++ b/Mlaumcherb.Client.Avalonia/классы/Пролетариат/InstalledGameVersionProps.cs
@@ -81,8 +81,8 @@ public class InstalledGameVersionProps : IComparable<InstalledGameVersionProps>,
                 new JsonMergeSettings { MergeArrayHandling = MergeArrayHandling.Concat });
             descriptorRaw = parentDescriptorRaw;
             // removing dependency
-            descriptorRaw.Remove("inheritsFrom");
-            File.WriteAllText(DescriptorPath, descriptorRaw.ToString());
+            // descriptorRaw.Remove("inheritsFrom");
+            // File.WriteAllText(DescriptorPath, descriptorRaw.ToString());
         }
 
         var descriptor = descriptorRaw.ToObject<GameVersionDescriptor>()
diff --git a/Mlaumcherb.Client.Avalonia/классы/Пролетариат/Libraries.cs b/Mlaumcherb.Client.Avalonia/классы/Пролетариат/Libraries.cs
index 091c99a..86f98c2 100644
--- a/Mlaumcherb.Client.Avalonia/классы/Пролетариат/Libraries.cs
+++ b/Mlaumcherb.Client.Avalonia/классы/Пролетариат/Libraries.cs
@@ -7,13 +7,28 @@ 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) 
+    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)
+    public static IOPath GetPathFromMavenName(string mavenName, string ext = "jar")
+    {
+        int sep_0 = mavenName.IndexOf(':');
+        if (sep_0 == -1)
+            throw new ArgumentException($"Invalid maven name: {mavenName}");
+        int sep_1 = mavenName.IndexOf(':', sep_0 + 1);
+        if (sep_1 == -1)
+            throw new ArgumentException($"Invalid maven name: {mavenName}");
+        var package = mavenName.Substring(0, sep_0).Replace('.', '/');
+        var artifact = mavenName.Substring(sep_0 + 1, sep_1 - sep_0 - 1);
+        var version = mavenName.Substring(sep_1 + 1);
+        string file_name = $"{artifact}-{version}.{ext}";
+        return Path.Concat(PathHelper.GetLibrariesDir(), package, artifact, version, file_name);
+    }
+    
+    private static IOPath GetPathFromArtifact(Artifact artifact)
     {
         string relativePath;
         if (!string.IsNullOrEmpty(artifact.path))
@@ -60,26 +75,30 @@ public class Libraries
                 }
                 
                 Artifact artifact = null!;
-                if(l.downloads.classifiers != null && !l.downloads.classifiers.TryGetValue(nativesKey, out artifact!))
+                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));
+                libs.Add(new NativeLib(l.name, GetPathFromArtifact(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));
+                Artifact? artifact = l.downloads?.artifact;
+                if (artifact is null)
+                {
+                    libs.Add(new JarLib(l.name, GetPathFromMavenName(l.name), artifact));
+                }
+                else
+                {
+                    // skipping duplicates
+                    if (!libHashes.Add(artifact.sha1))
+                        continue;
+
+                    libs.Add(new JarLib(l.name, GetPathFromArtifact(artifact), artifact));
+                }
             }
         }
 
diff --git a/Mlaumcherb.Client.Avalonia/сеть/TaskFactories/LibrariesDownloadTaskFactory.cs b/Mlaumcherb.Client.Avalonia/сеть/TaskFactories/LibrariesDownloadTaskFactory.cs
index 3d00145..aa14486 100644
--- a/Mlaumcherb.Client.Avalonia/сеть/TaskFactories/LibrariesDownloadTaskFactory.cs
+++ b/Mlaumcherb.Client.Avalonia/сеть/TaskFactories/LibrariesDownloadTaskFactory.cs
@@ -42,7 +42,7 @@ public class LibrariesDownloadTaskFactory : INetworkTaskFactory
         
         foreach (var l in _libraries.Libs)
         {
-            if (!HashHelper.CheckFileSHA1(l.jarFilePath, l.artifact.sha1, checkHashes))
+            if (!HashHelper.CheckFileSHA1(l.jarFilePath, l.artifact?.sha1, checkHashes))
             {
                 _libsToDownload.Add(l);
             }
@@ -60,7 +60,7 @@ public class LibrariesDownloadTaskFactory : INetworkTaskFactory
     {
         long total = 0;
         foreach (var l in _libsToDownload)
-            total += l.artifact.size;
+            total += l.artifact?.size ?? 0;
         return total;
     }
 
@@ -76,7 +76,7 @@ public class LibrariesDownloadTaskFactory : INetworkTaskFactory
         await Parallel.ForEachAsync(_libsToDownload, opt, async (l, _ct) =>
         {
             LauncherApp.Logger.LogDebug(nameof(NetworkHelper), $"downloading library '{l.name}' to '{l.jarFilePath}'");
-            if(string.IsNullOrEmpty(l.artifact.url))
+            if(string.IsNullOrEmpty(l.artifact?.url))
                 throw new Exception($"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)
diff --git a/Mlaumcherb.Client.Avalonia/холопы/HashHelper.cs b/Mlaumcherb.Client.Avalonia/холопы/HashHelper.cs
index b01c08a..73f6e4e 100644
--- a/Mlaumcherb.Client.Avalonia/холопы/HashHelper.cs
+++ b/Mlaumcherb.Client.Avalonia/холопы/HashHelper.cs
@@ -24,8 +24,8 @@ public static class HashHelper
         if (!File.Exists(f))
             return false;
         
-        if(checkHash)
-            return sha1 is not null && HashFileSHA1(f) == sha1;
+        if(checkHash && sha1 is not null)
+            return HashFileSHA1(f) == sha1;
 
         return true;
     }