I just see it offered on the Apple App Store and Google Play
https://turbotax.intuit.com/personal-taxes/mobile-apps/turbotax.jsp
The mobile app is just a portal to the Online version.
Online version system requirements
https://ttlc.intuit.com/community/system-requirements/help/turbotax-online-system-requirements/00/25...
Are you maybe looking at the Desktop download Requirements?
