If your system cannot run the downloaded version then you can ask for a refund ...
The unconditional 60-day money-back guarantee only applies to TurboTax CD/Download products.
System requirements for downloaded version:
https://ttlc.intuit.com/questions/1899173-turbotax-for-mac-minimum-system-requirements
And you can certainly use the online version ... choose your product here :
https://turbotax.intuit.com/personal-taxes/online/
