I had a similar problem with the CD version. I had actually finished entering all tax info and went to preview the forms and it crashed (also wanted to download a command line utility--why?). From then on when I tried to re-launch it would crash after checking for updates and I could not get back to my forms. Deleted app, reinstalled from CD. Still crashed. So, I decided it wasn't the app itself but probably some preferences issue. Go to Finder, open new Finder window, navigate to home folder, type Command-Shift-. (period) to show hidden folders, go into Library, go into Preferences, find com.intuit.turbotax.2020.plish and move it to the desktop. Try launching again. It should work, but you'll have to re-enter your registration info. After that, open the tax file that you hopefully saved before it crashed. As I said, this seems to have worked for me with the CD version. I don't know how it works with the download/online versions.
