Dear Gary,
Thank you for your query, and many thanks to Recep for answering it!
The forum is indeed for API issues only.
Therefore, you cannot expect an answer to a question such as yours relating to installation, product usage or end user support issues here.
You should try one of the non-API Revit product support discussion forums instead for that:
https://forums.autodesk.com/t5/revit-api-forum/this-forum-is-for-revit-api-programming-questions-not...
The people there are much better equipped to answer your question than us programming nerds.
By the way, I am also running Revit 2020 with no issues.
I hope this helps.
Thank you for your cooperation and understanding.
Best regards,
Jeremy