i think i stumbled upon the issue after i downloaded for pc and had the same issue. i believe it has to do with self-voicing. when it's on it always crashes at the same spot -that is, when the main characters receives a phone call from darci while he's roaming the power plant, he looks at his phone and the phone flashes twice - that's when the crash occurs. i think it's right before the light appears in the corner or the room.
Yeah, I fixed that problem and improved self-voicing in the next update. About Mac, I don't have a Mac, so I can't do any testing, but I do have one person in the discord server who usually plays on MAC and tells me if they are problems. If you want you can come to my discord server and help me test the MAC version, let me know. I'm on there every day, but I'm not on her every day.