ok, made a trial login and here is the link:
https://www.experts-exchange.com/questions/29080980/Install-Airprint-printer-on-macOS-HighSierra-with-lpadmin-command.html
i solved this a few years ago on experts-exchange.com. Unfortunately
you'd have to login to the site to find the solution. And since I don't
have my login anymore, I cannot copy-paste it here. Maybe someone else
with an e-e account? Best. Roger
According to my tests: The settings in /Library/Managed
Preferences/com.apple.SoftwareUpdate.plist will only come into effect if
the corresponding keys in
/Library/Preferences/com.apple.SoftwareUpdate.plist are missing. To
prevent standard users from...
