Thank you for the information on getting to OS Mojave. It is perfect except that I have only tried it on my MacBook Pro and it did not install so I assume my MacBook Pro is too old, as the directions said. I had to try it anyway because I had added so much memory I thought it might work.
I had a hard time getting here because the link from my iMac Pro wouldn't take me to this site. When I tried to copy the link and paste it into Apple Community, I couldn't get my password to work. I tried about 8 times with no success. Anyway, the answer is the answer I needed. I just have to get my desktop cleaned up after taking it back to the factory issue. Then I will try the Mojave there. The Catalina certainly has been too much problem for me. Can't try that again.
Thank you again. I'm glad I finally got here.
Silverfox