You are off to a good start. Perhaps others will chime in on this thread.
However, I would be willing to bet that, regardless of whether the software is officially supported, it will install and run just fine on Windows 7 (which is essentially what happened with Windows XP).
Microsoft will implement Windows 7 "end of life" in January 2020, meaning it will discontinue all support, including paid support; and all updates, including security updates.
Hackitoff: Exactly. After 20 years with TT I hate to switch to another tax program, but TT is forcing my hand. Win7 is working beautifully for me and I don't want the hassle of changing OS. That always incurs unexpected problems and it takes days to get everything the way you want it. And, of course, there's always the issue of certain programs you use all the time suddenly not working on the new OS. And TT online is simply not a viable option. My return is too complex, plus I do returns for several family members.
I doubt that TT will keep Win 7 access for much longer ... even my professional program will required Win 10 for next tax season ... this means I need to upgrade 7 computers by the end of the year.
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.
When I received the notification that Windows 7 will not be supported by TT I upgraded to Windows 10 and it has, and is, a train wreck. It keeps trying to update Windows 10 that was installed and freezes my computer.
For security reasons, there is zero chance that 2019 TurboTax will be supported under Windows 7 because extended support for Windows 7 ends before the filing deadline for 2019 tax returns.
Although a bit cumbersome, there are ways to run TurboTax in a Windows 10 virtual machine running on a Windows 7 host system.
This "Community" is mostly just a bunch of users ( as am I )...and actual TTX staff do not visit here regularly in the off-season, other than to correct some flagged items ( where people have put in personal information for hackers to steal and use).
To send feedback directly to TTX, just start up your TTX 2018 desktop software...go up to the "Help" menu item and there is a feedback selection in that dropdown, to send your comments/requests directly to TTX.