20.2.171 Upgrade Layout won't open any pre 2020 created files

Just installed up date and tried to use Layout to open exiting pre 202 created files spinning wheel and then crashes. It will open 2020 created files.

Any ideas?

It should open older files but there have been a few reports where certain entities in older files were problematic. I think @adam has had some experience in that area.

Can you share a LayOut file that is a problem?