If you are on Windows, the save file is located in this path AppData\Roaming\Godot\app_userdata\Lure Of Passion there is a folder with your version of the game.
Oh, I'm not sure about that, if you just want to transfer the save to a new version, you'll just need to update the game, but I can't say where the file itself is, I can only assume that it's somewhere in the application files.
