Dan, Thanks for your reply.

I have been considering upgrading to 21 but the list of problems with this new version has been amazingly long!
Although there have been lots of fixes already, I can't help reading about new bugs that are reported. How long before the software will be working fully, I wonder...

I had resigned to skip this version and to upgrade in 2022 but now I received another email about the extended sale.
Choices, choices!