There's no critical limits when using the Online Browser-based software (other than only "one" tax return allowed and no "Forms Mode")
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But be careful on your OS terminology here...
...the downloads work on MAC-OS versions, but not on iOS versions (unless I'm grossly mistaken). But check here
<a rel="nofollow" target="_blank" href="
https://ttlc.intuit.com/questions/1899173-minimum-system-requirements-for-turbotax-mac-software">htt...>
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
