When you purchase the TurboTax software it is licensed for installation on all the computers that you own, no one else's. You can create, complete and file multiple tax returns from the installed software on your computer.
Mac minimum requirements - https://ttlc.intuit.com/community/system-requirements/help/minimum-system-requirements-for-turbotax-...
The TurboTax desktop edition software cannot be installed on mobile devices.
