Add vstor redist and signature check

dx

@@ -104,6 +104,29 @@ function Main {
         Start-Process -FilePath $aria2Exe -ArgumentList $argumentList -NoNewWindow -Wait
     }
 
+    # --- Check Signature ---
+    foreach ($item in $downloads) {
+        $outFile = Join-Path $tempDir $item.Name
+        Write-Host "Verifying signature of $($item.Name)..."
+        $signature = Get-AuthenticodeSignature $outFile
+        if ($signature.SignerCertificate.Subject -like "*CN=Microsoft Corporation*" -and $signature.Status -eq "Valid") {
+            Write-Host "✅ Valid Microsoft signature found from $($item.Name)."
+        }
+        else {
+            Write-Warning "⚠️ $($item.Name) is not signed by Microsoft. The download may get corrupted or your PC is infected with virus."
+            $response = Read-Host -Prompt "Would you like to proceed anyway? (Y/N)"
+            if ($response -eq 'Y' -or $response -eq 'y') {
+                continue
+            }
+            elseif ($response -eq 'N' -or $response -eq 'n') {
+                return 1
+            }
+            else {
+                Write-Host "Invalid input. Please enter Y or N."
+            }
+        }
+    }
+
     # --- Install DirectX ---
     Write-Host "Installing DirectX..."
     Start-Process -FilePath "$tempDir\directx_redist.exe" -ArgumentList "/Q /T:`"$tempDir`"" -Wait