fixed some bugs, added ability to work without internet

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

@@ -29,7 +29,6 @@ public class InstalledVersionCatalog
         }
 
         catalog.CheckInstalledVersions();
-        catalog.Save();
         return catalog;
     }
 
@@ -44,6 +43,7 @@ public class InstalledVersionCatalog
 
     /// <summary>
     /// Check if any versions were installed or deleted manually.
+    /// Calls <see cref="Save"/>
     /// </summary>
     public void CheckInstalledVersions()
     {
@@ -53,17 +53,16 @@ public class InstalledVersionCatalog
         {
             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.");
-            
+            {
+                LauncherApp.Logger.LogWarn(nameof(CheckInstalledVersions), 
+                    $"Can't find version descriptor file in directory '{subdir}'. " +
+                    $"Rename it as directory name.");
+                continue;
+            }
+
             if (versions.TryGetValue(id, out var foundProps))
-            {
                 versionsUpdated.Add(foundProps);
-            }
-            else
-            {
-                versionsUpdated.Add(new InstalledGameVersionProps(id, null, null));
-            }
+            else versionsUpdated.Add(new InstalledGameVersionProps(id, null, null));
         }
 
         // reverse sort
@@ -73,5 +72,7 @@ public class InstalledVersionCatalog
             versionsUpdated.Select(props =>
                 new KeyValuePair<string, InstalledGameVersionProps>(props.Id, props)
             ));
+        
+        Save();
     }
 }