The TurboTax online editions are only for tax year 2022.
To complete and file a 2020 tax return using TurboTax you would need to purchase, download and install on a personal computer, Window or Mac, one the desktop editions from this website - https://turbotax.intuit.com/personal-taxes/past-years-products/
A 2020 tax return can only be printed and mailed, it cannot be e-filed using TurboTax.
