Is it possible to transfer save files between two downloads for Mac? I've played through to completion for two different games only to have it crash in both places. And, I don't want to play through everything to the Natasha scene all over again.
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/