For the LLC......both the Business files and personal files end in the same .tax2019. If you don't have the main .tax file you might have one that starts with a Tilde sign ~ like "~your name.tax2019". That file is if your computer crashes or your real file gets lost or deleted or corrupt so you can restore it.
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. Then 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.
FOR PERSONAL
You downloaded the .tax2019 file, good. You do not open it in the 2020 program (you can only open it in the 2019 personal program). You need to TRANSFER it into a new blank 2020 return. Start a new 2020 return, Go up to FILE - NEW -or- click on the Start a New Return button. Then it will try to find a 2019 file to transfer. Let it look for a long time, if it doesn't find one you can Browse to where you downloaded it.
