Transfer from Online into the Mac Desktop program. Expand the section on Transferring from Online
https://ttlc.intuit.com/community/tax-data-file/help/how-do-i-transfer-last-year-s-return-into-the-t...
One way is to start a 2020 Online return and transfer into that. Then you can download the .tax2020 file from online and just OPEN it in the Desktop program.
