Hopefully you've solved your issue by now...
I went through a series of suggestions posted here. (I'm also using a mac, (old mac, still on High Sierra) bought my TT on a CD from Costco)
First, uninstall Turbotax. I googled "uninstall turbotax mac" and got step by step instructions to hunt down all of the support files and destroy them.
Next re-install. I was on the phone with support through this, so they directed me to download the software, provided a link, etc. I don't think it made any difference, as I had incompletely uninstalled and reinstalled TT a few times before. All that matters is finding the support files.
Once it was reinstalled it picked up where I left off, got to the pay screen, and repeatedly crashed. At least the software restarted, and it recognized that I had already paid. (I might have to credit TT support for that last part.)
After doing this a few times I remembered reading another post that noted two "close" buttons after the pay screen, one big blue one and one small grey one. I'd been using the big blue one because the grey one is covered up by the apps on the dock, hard to see and hard to get to. Use the small button. It closes the window and moves on to the next screen without crashing.
Taxes are filed.
Thank you everyone who posted here - you all were far more helpful than TT support. I hope you are all well and have solved your tax problems.
