10.5 Trial / elicense issue

Trying to run the 10.5 Trial. I’ve downloaded the program, have a USB elicense. The 10.5 trial shows in the License list.
When I try to start the license usage period I get an error, “An error occurred which prevented the operation from succeeding”.
I have restarted, ran maintenance, and anything else I can think of. I have been a long time Cubase user from 5 to 9.5 and am looking to get back into working with a DAW. Any assistance would be appreciated.