May I ask why you did that? You cleared your online return? The only way to use the .tax2020 file you downloaded is to open it in the installed Desktop CD/Download program.
Buy the personal Desktop CD/Download programs here
https://turbotax.intuit.com/personal-taxes/cd-download/
After you get the program installed the first thing to do before you open your tax return is to update the program and install any state programs you had. Then open your file. So you first might need to start a fake return to be able to download the state program (go to File-New Tax Return).
Then go to FILE -Open and find your return.
