diff --git a/MinecraftLaunch/Components/Launcher/Launcher.cs b/MinecraftLaunch/Components/Launcher/Launcher.cs
index 3445a98..8b1b9cd 100644
--- a/MinecraftLaunch/Components/Launcher/Launcher.cs
+++ b/MinecraftLaunch/Components/Launcher/Launcher.cs
@@ -46,7 +46,7 @@ public async ValueTask<IGameProcessWatcher> LaunchAsync(string id) {
         var process = CreateProcess(arguments, versionPath);
 
         LibrariesResolver librariesResolver = new(gameEntry);
-        await Launcher.ExtractNatives(versionPath, librariesResolver);
+        await ExtractNatives(versionPath, librariesResolver);
         return new GameProcessWatcher(process, arguments);
     }
 
diff --git a/MinecraftLaunch/Extensions/DownloadEntryExtension.cs b/MinecraftLaunch/Extensions/DownloadEntryExtension.cs
index 5c89d7d..d7c7b84 100644
--- a/MinecraftLaunch/Extensions/DownloadEntryExtension.cs
+++ b/MinecraftLaunch/Extensions/DownloadEntryExtension.cs
@@ -22,6 +22,9 @@ public static bool Verify(this IDownloadEntry entry) {
         if(!File.Exists(entry.Path))
             return false;
 
+        if (entry.Checksum == null)
+            return true;
+
         using var sha1Provider = SHA1.Create();
         using var fileStream = File.OpenRead(entry.Path);
         byte[] sha1Bytes = sha1Provider.ComputeHash(fileStream);