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As Adorable Dracula, and the Dev, themselves said. 

"Not worth it"

You're better off playing a new save fixing it takes time and you will face bugs, and crashes, frequently. 

To load into the game with such an old save, all you need to do is take the missing files from the old version, both the .png AND the .rpgmvp, and move them to the same folder in the new version.

But, like Arch said, this doesn't fix the save. You'll still need to do a New Game Plus anyway.

Up to you if that's worth it.

alright, thanks for the input

Unfortunately, it's just too outdated at this point. If you're on desktop though, you can navigate to the folder with the missing file, and put a dummy file in there to trick the game into thinking everything's fine. Then just save your game and it should work.