diff --git a/Launcher-Core/Launcher-Core.csproj b/Launcher-Core/Launcher-Core.csproj
index 839f8a6..c4ab723 100644
--- a/Launcher-Core/Launcher-Core.csproj
+++ b/Launcher-Core/Launcher-Core.csproj
@@ -8,16 +8,17 @@
     <PublishSingleFile>true</PublishSingleFile>
     <EnableCompressionInSingleFile>true</EnableCompressionInSingleFile>
 
-    <IsAotCompatible>false</IsAotCompatible>
+    <PublishTrimmed>false</PublishTrimmed>
 
   </PropertyGroup>
   <ItemGroup>
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="CmlLib.Core" Version="4.0.4" />
-    <PackageReference Include="SharpCompress" Version="0.39.0" />
+    <PackageReference Include="CmlLib.Core.Auth.Microsoft" Version="3.2.2" />
+    <PackageReference Include="XboxAuthNet.Game.Msal" Version="0.1.2" />
   </ItemGroup>
 
-  
+
 
 </Project>
diff --git a/Launcher-Core/Launcher.cs b/Launcher-Core/Launcher.cs
index 511dcc3..16b2cdd 100644
--- a/Launcher-Core/Launcher.cs
+++ b/Launcher-Core/Launcher.cs
@@ -4,7 +4,9 @@ using System.Runtime.InteropServices;
 using System.Security.AccessControl;
 using CmlLib.Core;
 using CmlLib.Core.Auth;
+using CmlLib.Core.Auth.Microsoft;
 using CmlLib.Core.ProcessBuilder;
+using XboxAuthNet.Game.Msal;
 
 namespace Plombir;
 
diff --git a/Launcher-Core/Program.cs b/Launcher-Core/Program.cs
index 7a3ff86..c48c13e 100644
--- a/Launcher-Core/Program.cs
+++ b/Launcher-Core/Program.cs
@@ -2,8 +2,12 @@ namespace Plombir;
 
 sealed class Program
 {
-    public static void Main()
+    public static async Task Main()
     {
         Console.WriteLine("init: launcher");
+        // var ln = new Launcher("test", "1.20.1");
+        // var s = await Utils.GetLicensedSession();
+
+        // Console.WriteLine(s.CheckIsValid());
     }
 }
diff --git a/Launcher-Core/Utils.cs b/Launcher-Core/Utils.cs
index 86cf813..dc57163 100644
--- a/Launcher-Core/Utils.cs
+++ b/Launcher-Core/Utils.cs
@@ -1,11 +1,9 @@
-using System.IO.Compression;
 using System;
 using System.IO;
-using SharpCompress.Archives;
-using SharpCompress.Common;
-using SharpCompress.Readers;
-using System.Diagnostics;
 using CmlLib.Core;
+using CmlLib.Core.Auth;
+using XboxAuthNet.Game.Msal;
+using CmlLib.Core.Auth.Microsoft;
 
 namespace Plombir;
 
@@ -27,6 +25,31 @@ static public class Utils
 
     }
 
+    /*
+        Method is working, but we need to wait for client-id approval.
+    */
+    public static async Task<MSession>? GetLicensedSession()
+    {
+        try
+        {
+            var app = await MsalClientHelper.BuildApplicationWithCache(
+                "d87c436c-aad0-46ea-b392-b53b3ed787b1"
+            );
+            var loginHandler = JELoginHandlerBuilder.BuildDefault();
 
-
+            var authenticator = loginHandler.CreateAuthenticatorWithNewAccount(default);
+            authenticator.AddMsalOAuth(app, msal => msal.DeviceCode(deviceCode =>
+            {
+                Console.WriteLine(deviceCode.Message);
+                return Task.CompletedTask;
+            }));
+            authenticator.AddXboxAuthForJE(xbox => xbox.Basic());
+            authenticator.AddJEAuthenticator();
+            return await authenticator.ExecuteForLauncherAsync();
+        }
+        catch (Exception e)
+        {
+            throw new Exception($"Failed to authentificate! {e}");
+        }
+    }
 }