Report Will this run on Mac OS Big Sur? in Express Invoice Posted Thursday at 03:45 PM I am not 100% confident but I would say, yes it should work. as Previous versions and Catalina have a major structural difference of elimination of 32Bit programs. Going forward it will be minor differences so should be okay but who knows. 🙂 if you happen to try it. please post results as well as I will be waiting for a little while before upgrading any ways. Thanks.