Fix the issue with not including using Newtonsoft.Json.Linq;

Author: Shxde1

Form/KeyAuth.cs

@@ -11,9 +11,10 @@
 using System.Collections.Generic;
 using System.Security.Cryptography.X509Certificates;
 using System.Net.Security;
-using System.Windows;
+using Newtonsoft.Json;
 using System.Threading;
 using System.Runtime.CompilerServices;
+using Newtonsoft.Json.Linq;
 
 namespace KeyAuth
 {