I have the same problem - TT won't run iMac and OS Sierra 10.12.6. OS 13.xx is not available for this machine. Intuit appears unresponsive to your request for help on this forum and doesn't show a way to get personal help that I could find. I've been using TT for as long as I can remember, pushing 20 years. At minimum I want my money back. I will request AARP to help if I don't get at least that - and would go so far as to write an article for the AARP magazine identifying this as a Scam, although I would prefer to get a version of TT that will actually run on my current computer.
