Your real problem is Microsoft, in that Microsoft brought out Windows 10 but did not make it 100% backward-compatible with Windows 7.
It is very expensive to maintain software on multiple hardware and software platforms - that is why most software companies (not just Intuit) will cease support of their software when Microsoft stops support of the underlying operating system. I say this as someone with 30+ years experience in software development and support.
As noted above, your 2019 TurboTax software may still work fine on Win 10, if it doesn't use any operating systems calls that are unique to Win 10. It is definitely worth trying before you go off and invest time and energy in a new tax product.