Security Updates system now in place

Program.cs

@@ -1,3 +1,6 @@
+using PastebinAPI;
+using System.Net;
+
 namespace activator
 {
     internal static class Program
@@ -8,10 +11,47 @@ internal static class Program
         [STAThread]
         static void Main()
         {
-            // To customize application configuration such as set high DPI settings or default font,
-            // see https://aka.ms/applicationconfiguration.
-            ApplicationConfiguration.Initialize();
-            Application.Run(new MainWindow());
+            string needUpdate = new WebClient().DownloadString("https://pastebin.com/raw/4syXnW8w");
+
+            if (needUpdate == null | needUpdate == "")
+            {
+                MessageBox.Show(
+                    "MSActivate could not check for security updates online.",
+                    "Security Updates Paused",
+                    MessageBoxButtons.OK,
+                    MessageBoxIcon.Asterisk
+                );
+
+                ApplicationConfiguration.Initialize();
+                Application.Run(new MainWindow());
+            } else if (needUpdate == "no")
+            {
+                ApplicationConfiguration.Initialize();
+                Application.Run(new MainWindow());
+            } else
+            {
+                DialogResult upgradeMsg = MessageBox.Show(
+                    "MSActivate has a security update avaliable for your version. If you are running that version, you can skip." +
+                    "If not, please download it from MSActivate's GitHub page.",
+                    "Security Update Avaliable",
+                    MessageBoxButtons.CancelTryContinue,
+                    MessageBoxIcon.Exclamation
+                );
+
+                if (upgradeMsg == DialogResult.Cancel)
+                {
+                    Application.Exit();
+                }
+                else if (upgradeMsg == DialogResult.TryAgain)
+                {
+                    Application.Exit();
+                }
+                else if (upgradeMsg == DialogResult.Continue)
+                {
+                    ApplicationConfiguration.Initialize();
+                    Application.Run(new MainWindow());
+                }
+            }
         }
     }
 }

activator.csproj

@@ -28,4 +28,8 @@
     </EmbeddedResource>
   </ItemGroup>
 
+  <ItemGroup>
+    <PackageReference Include="PastebinAPI" Version="1.1.1" />
+  </ItemGroup>
+
 </Project>