Explicitly uninstall existing version before install to avoid MSI upgrade elevation failure

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1-estudio-Install-TacticalRMM-and-RustDesk.ps1

@@ -26,6 +26,27 @@ $rustdeskService    = 'ScoutIT-RemoteSupport'
 function Install-RustDesk {
     $msiPath = "$env:SystemRoot\Temp\$rustdeskMsi"
 
+    # Uninstall any existing version first (prevents MSI upgrade elevation failure)
+    $uninstallKeys = @(
+        'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*',
+        'HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\*'
+    )
+    foreach ($key in $uninstallKeys) {
+        Get-ItemProperty $key -ErrorAction SilentlyContinue |
+        Where-Object { $_.DisplayName -match 'ScoutIT-RemoteSupport|ScoutIT RemoteSupport|rustdesk' -or
+                       $_.Publisher   -match 'scoutit|rustdesk' } |
+        ForEach-Object {
+            $productCode = $_.PSChildName
+            Write-Host "Found existing install: $($_.DisplayName) [$productCode] - uninstalling..."
+            Stop-Service -Name $rustdeskService -Force -ErrorAction SilentlyContinue
+            Start-Process -FilePath "msiexec.exe" `
+                          -ArgumentList "/x `"$productCode`" /qn /norestart" `
+                          -Wait
+            Start-Sleep -Seconds 10
+            Write-Host "Existing version removed."
+        }
+    }
+
     # Download
     Write-Host "Downloading ScoutIT Remote Support client..."
     Try {