hey, if you still have the 0.10, try to use "save as old version" option (in project menu just under save as). If it still give you an error I can look at your file if you want
Edit: don't override your current file because you may loose new functionalities.
Ok I read badly do you have PixelOver on itch.io also ? I can't do that on Steam but I could let the last stable version available on itch