I have the game downloaded twice. Once with the old save file and the crashing ending and once with no save file and fixed of the ending. Is there a way to bring the save file from one to the other?
There may, but I don't know how; the Mac version's file setup is a lot more obtuse than on PC.
You could make a post on the RPG Maker help forums? I've had good luck there with all sorts of issues:
https://forums.rpgmakerweb.com/index.php?forums/rpg-maker-mz-support.180/