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.
Or you can use the paper forms and prepare them by hand:
2020
https://www.irs.gov/pub/irs-pdf/i1040gi.pdf
https://www.irs.gov/instructions/i1040gi
https://www.irs.gov/pub/irs-prior/f1040--2020.pdf
https://www.irs.gov/pub/irs-prior/f1040s1--2020.pdf
https://www.irs.gov/pub/irs-prior/f1040s2--2020.pdf
The https://turbotax.intuit.com/personal-taxes/[product key removed]cts/ link only goes back to 2021, and does not include 2020. I know TurboTax existed for 2020. How can I get it?
Thanks.
There seems to be a problem accessing 2020. You need to call support.
How to contact Turbo Tax
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-contact-turbotax/00/26991
What is the Turbo Tax phone number
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632