(edited: Oh...going from Windows to a MAC...be careful though, for the use of the actual software, MACs have a far more limited backward software compatibility than Windows 10 does)
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.....make sure you create PDF files for each of the prior years ( both a filing-only PDF, and a PDF with all forms and worksheets) on the MAC Windows computer first, just in case you have difficulty installing the prior year's software on the new MAC computer.
TTX still has 2018 and 2019 Downloads for Windows MACs, but looks like they've already removed 2017. For any years earlier than 2018, even of you can find the software, you may not be able to update them, or load your states.......and those would be required to be able to open any .taxyyyy datafiles you may have.....so the PDFs would be critical to save for those earlier years so that you have an exact record of what you actually filed
(2017 software is likely in a hazy area as to whether it could be fully updated in the next couple months, along with any states you would need to open any 2017 datafiles you have...so get those PDF files created now if you don't already have them)
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
