Turbotax does not support years prior to 2019. if you are due a refund for any earlier year it's forfeit because you didn't file timely. If you owe the IRS can come after you forever
to do 2019 or 2020 you need to purchase the desktop app for that year - full PC or MAC. you will not be able to e-file those returns. you can go to the IRS website to download and manually prepare those years or even earlier. you can find websites selling the app for earlier years. it's basically its a waste of money because the app can not be updated. you can't e-file. state returns are not available
https://turbotax.intuit.com/personal-taxes/past-years-products
https://www.irs.gov/forms-pubs/prior-year
