Each tax year is a separate TurboTax program. Using the TurboTax desktop editions you can create, complete and file as many tax returns as needed.
TurboTax 2020 desktop CD/Download editions - https://turbotax.intuit.com/personal-taxes/cd-download/
TurboTax 2019 desktop download editions - https://turbotax.intuit.com/personal-taxes/past-years-products/
A 2019 tax return can only be printed and mailed, it cannot be e-filed.
