You need the data file ending in .tax2020. Hopefully you saved it and have a backup. Search your computer for it. Check the Recycle Bin or Trash. Check in One Drive, etc. it should be in your Documents then in the Turbo Tax folder. Check your backups.
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.
