Turbotax no longer supports opening the 2020 return. you have two options. 1) request either a copy of the return (form 4506) or a transcript (form 4506-T also available if you register online) from the IRS.
https://www.irs.gov/site-index-search?search=4506&field_pup_historical_1=1&field_pup_historical=1
2) to use at your own risk. upload the 2020 tax file and e-mail it to taxprinter.com (not affiliated with Intuit)
https://www.taxprinter.com/
