Are you trying these steps? Try opening 2023 program and see if you can get your 2023 return to show up in it. Go to FILE - OPEN. Then save it again with a name and place you can find. Go to File - Save As. Then start a new 2024 return, go up to File-New and transfer from the 2023 file. If it doesn’t find your .tax2023 file you can browse to where it is.
