whenever I try loading a save this happens? the game only works through autosave
I believe this is because the save file is not updated. I usually trash it and restart. I know there is a better way to solve it but it's likely has to do with files and I'm on mobile so I can't do much. Try getting Tiny Dracula to help. She and FarGuy-Arch are usually the MVP's when someone needs help with something like this.
Aye, you can get the save to load still. Track down "p-zbrow1.png" and "p-zbrow1.rpgmvp" from the old version and copy them to the new version.
But your save will still be broken, and you'll need to do a New Game Plus anyway.
At least you'll have the option to keep your appearance, money, skills, stats, and most items.