In CVAD 7 1808 and earlier the installers for the Virtual Delivery Agent and Universal Print Client would start and stop the Windows spooler service during installation.
In CVAD 7 1903 and later the installation wizard will require the Windows spooler service to be running at the beginning of installation. If the Windows spooler service isn’t running the installation wizard will display an error message. Additionally, a reboot will be required after installing the Virtual Delivery Agent and Universal Print Client.