When I open C12 and select 'Run as administrator'

KT66, do you have your Waves license keys loaded in a USB drive?

You might be right about the’ admin sign into Cubase’? This hadn’t even occurred to me. This wasn’t where I was going with my original post, nor anything I was doing to make the Waves plugins work in Cubase. My issue was that Waves would (after I had signed into Cubase and opened a previous Project - without admin rights!) open a window in Cubase that reported that one of the Waves plugins previously loaded on an insert, was an expired Waves trial plug-in. Basically telling me that I did not own the plug-in when, in fact, I did own it. This, as my last post explained, was all resolved when I loaded the license keys onto a USB drive.

I was misunderstanding the poster then.