crash on starting an updated session (apple Mac version/Catalina)

Hi - I just updated to OSX Catalina and also to to the latest version of Scrivener, which I downloaded from the App Store.

It crashes every time I use it. Usually on the dialogue where I try to open an old file and it wants to make a backup copy before continuing. If I open it with a downloaded (non-licensed) version of Scrivener from your own site it is OK. If I open it with, say, the tutorial it is okay.

I have quite a lot of inaccessible work in the system at the moment. I guess you have an older version on the App Store.

Please assist.