Use curl.exe for TacticalRMM download to fix TLS failure

WebClient uses the old .NET TLS stack which fails to negotiate with
agents.tacticalrmm.com. curl.exe (built into Win10/11/Server2019+)
uses the OS TLS stack and handles redirects reliably.

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

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

@@ -177,7 +177,8 @@ If (Get-Service $serviceName -ErrorAction SilentlyContinue) {
 
     Try {
         Write-Host "Downloading TacticalRMM agent..."
-        (New-Object System.Net.WebClient).DownloadFile($downloadlink, "$OutPath\$output")
+        & curl.exe -L -s -o "$OutPath\$output" $downloadlink
+        if ($LASTEXITCODE -ne 0) { throw "curl download failed with exit code $LASTEXITCODE" }
         Write-Host "Download complete."
         Start-Process -FilePath "$OutPath\$output" -ArgumentList '/VERYSILENT /SUPPRESSMSGBOXES' -Wait
         Write-Host "Extracting..."