That's right! The new save system is not compatible with the previous progress. My suggestion is to enter the game, even if it appears that way, and go to Settings >> Data Settings >> Erase Progress, to ensure that you start the game with fresh and new data.
Alternatively, you can: run execute (win + R), type %appdata%..\LocalLow look for the NightGames folder, and delete it. This will completely reset the game without any errors.