I need to file 2020 taxes for my friend. He didn’t work in 2021.

[DoninGA]

To complete and file a 2020 tax return using TurboTax you would need to purchase, download and install on a personal computer one of the 2020 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.

[SweetieJean]

Did he have nay income of any type in 2020?  Is he a dependent?

[bosso3]

Your friend will need to sign the return.  Don't forget state return if applicable.