Sadly you will have to upgrade your windows to upgrade your Turbo Tax program. Before you do remember to back up your save file. You may also want to import that save file before upgrading the Turbo Tax program.
Here is an article on saving a back up of your file.
https://ttlc.intuit.com/replies/3302142
Here is some information on system requirements
https://ttlc.intuit.com/replies/3302353
