Lacerte will require Windows 10 for the 2019 tax program due to Microsoft no longer supporting Windows 7, but what if you bought the Extended Service Unit from Microsoft per their website.  "As of January 14, 2020, Microsoft will no longer be providing support or security updates for Windows 7 -- apart from for those who are willing to pay for it. The company is offering up to three years of Windows 7 Extended Security Updates (ESU), and pricing has just been revealed"