I had problems with the 2.7 version stand alone with the new Big Sur Mac operating system release.
In the daw it seemed to work fine, but the stand alone had a display glitch where it would only display the title bar, but nothing else.
Anyway, I had been reluctant to upgrade to 2.9, but went ahead with it, and it seems to work fine on Big Sur so far.
Something I noticed, is the discounted upgrade expires on Dec 31, 2020
I wasn't originally aware of that, so it might be nice to remind people that their upgrade discount is expiring soon.