@redjamie
@deanlsteele
@TomK
Apparently, 10.13 or "higher" (but "higher" does not guarantee 10.15 or 10.16 etc, unless they are released before 2019 TTX is released. OS X versions released after the TTX software comes out may not always work with the earlier years desktop software either).
https://ttlc.intuit.com/community/after-you-file/discussion/re-what-version-of-mac-os-is-needed-for-...
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
