@ krzpez
See the edit I made in my comment above in reference to Windows 8.1, if that's what you are using. As you'll see, there's an inconsistency in the OS requirements FAQs I provided. I suspect that System Requirement FAQ that only mentions Windows 10 is in error and should actually include Windows 8. In fact the CD jacket itself says "Windows 8 or higher." I'll notify TurboTax administrators in case they need to correct that System Requirement FAQ.
And I just found a third FAQ, also updated a week ago, that also says 2020 TurboTax can use Windows 8 or higher.
https://ttlc.intuit.com/community/tax-topics/help/what-if-i-don-t-want-to-upgrade-from-windows-7/00/...
Hopefully, the alternate method I provided in my comment earlier will let you launch the setup file on the CD and proceed to installation.
