Craft an ol' good batch file, where people type yes to accept (it's just an if).
Then you can execute the installer from within the batch file.
The following command line parameters can be passed to the setup, to make it install silently:
/dir="Dirname"
Sets installation directory to Dirname.
/no restart
Suppresses a reboot at the end of the installation.
Not required since the installation no longer requires are boot.
/silent or /very silent
Suppresses either pop-up of dialog boxes or any GUI at all.
/loadinf="Filename"
Loads the configuration file Filenamefor the installation.
This configuration file can be generated by going through setup with UltraVNC-xxxx-Setup.exe /saveinf="Filename".
Filename should be fully qualified.
/log
Writes a log file to the Temp directory.
Could be used for debugging.
Unfortunately, there are no cli server switches you can use to quickly configure the server