@KC Kirk You should be able to install TT Business on Windows 10. Maybe your computer needed to install some Windows Updates. Or could you have bought Home & Business instead?
When you copy the .tax2024 file be sure to get the right one. Both the personal versions and the Business program use the same file extension as .tax2024.
For Windows…..What I would do on the old computer, is copy the whole Turbo Tax folder that is under your Documents. That should be where the .tax files and pdf files are stored. Also if you haven't done it, I would open each year in the program and save it as a pdf file, go to FILE - SAVE TO PDF so you don't need the program installed to view your return. Copy that folder to a flash drive or best yet is to burn it to a CD or DVD and then you will have a backup of them. Then on the new computer copy the folder (or files) from the flash drive to your Documents folder.
See this article on how to move your tax return to another computer…….
https://ttlc.intuit.com/community/tax-data-file/help/how-do-i-move-my-tax-data-file-to-another-compu...
