Yes, you can use the CD/Download TurboTax software for 2019 tax returns in Windows 7 when you file your 2019 tax return in 2020. They don't recommend it because of security concerns, since Windows 7 will no longer get security updates. But it will work.
TurboTax CD/Download software for 2020 tax returns, which you will file in 2021, will not work in Windows 7.
You can also use TurboTax Online in Windows 7.
See the following FAQs for more information.
Windows 7 end of support impact for TurboTax
What if I don't want to upgrade from Windows 7?
