The lack of Forms Mode in Online TurboTax would be a huge drawback for me.
At this point in time I personally haven't seen TurboTax outright state that the 2025 product won't install and work on Windows 10. Granted, I don't see "everything." 😏 They may not even know yet since it's still in development. The FAQ below says that they "may" restrict installation. If they do, it's likely because they are hesitant about the lack of security updates for many people using Windows 10 (although apparently one will be able to purchase a security subscription for Win 10 from Microsoft.)
FAQ: How does the end of support for Windows 10 affect my TurboTax Desktop experience?
https://ttlc.intuit.com/turbotax-support/en-us/help-article/download-products/end-support-windows-8-...
