Yes you can only Transfer into a new return.
Here's an idea. Do you still have 2023 installed? Try opening 2023 program and see if you can get your 2023 return to show up in it. Go to FILE - OPEN. And see if that is the right one.
Then in the 2023 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 .tax2023. Then close the 2023 program. Then start a new 2024 return and transfer from the 2023 file.
