Here's an idea. Do you still have 2019 installed? Try opening 2019 program and see if you can get your 2019 return to show up in it. Go to FILE - OPEN. And see if that is the right one.
In the 2019 program do a File-Save AS and give it a easy name you can find or search for. And note where it saves it or select where to save it so you can find it again. The file will end in .tax2019. Then close the 2019 program. Then start a new 2020 return and transfer from the 2019 file.
Are you on Windows 10? That can move files to different spots like to One Drive. Or to Drop Box. Could it be under a different user on your computer?
Also if you can open your 2019 return in the 2019 Program then look and see if you marked the business as FINAL, then it wouldn't transfer over. You can change that and save 2019. Then transfer from 20i19 again.
