A: No. The product key will be rejected. You must uninstall retail and reinstall from volume media.
"Detected Office 2019 C2R Retail could not be converted to volume."
# Check for Office C2R Retail $officePath = "HKLM:\SOFTWARE\Microsoft\Office\16.0\ClickToRun" if (Get-ItemProperty -Path $officePath -Name "Platform" -ErrorAction SilentlyContinue) Write-Host "Detected Office C2R. Initiating removal..." # Run ODT removal mode Start-Process -Wait -FilePath "setup.exe" -ArgumentList "/configure uninstall_retail.xml"