After checking out all the options ingame, there's a way to start from a certain point! Just choose "chapter select" and choose a point from there
When I chose the class trial, a black screen was still shown (I did hear dialogue and music, but after wildly clicking buttons the game crashed) But when I choose the option before it, I could play the game as usual! I do have to redo certain parts, but it's better than replaying the whole game