Thank you for the reply. It is a strange one. I am building a dev laptop so I can work when away and the install was done for both 11.3 and 12 at the same time. 11.3 worked and 12 didn’t.
The files are there, and if I select Add in design packages and select them the same message comes up.
I will remove them from 12 if they are not really needed.
Thanks again.
Dave