You need to download the .tax file from online to transfer into the Desktop program. Log into your account. Under Your tax returns & documents, select Download .tax file (not the PDF) for the prior year you want and save it to your computer. Then start a new blank return, go up to File-New and transfer from the .tax file you saved.
Or another 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.
