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

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

2-estudio-Install-RustDesk-Standalone.ps1

@@ -9,11 +9,26 @@ $rustdeskService    = 'ScoutIT-RemoteSupport'
 
 [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
 
-# ── Check if already installed ────────────────────────────────────────────────
-$svcCheck = Get-Service -Name $rustdeskService -ErrorAction SilentlyContinue
-if ($null -ne $svcCheck) {
-    Write-Host "ScoutIT Remote Support is already installed. Exiting."
-    exit 0
+# ── Uninstall any existing version first (prevents MSI upgrade elevation failure) ─
+$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 the service first so MSI uninstall doesn't hang
+        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."
+    }
 }
 
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