GTA V Bootcamp Crashing

I have a MacBook Pro and a PS4, the main reason I want GTA V is to play LSPDFR because I really enjoyed it the one time I got to play it on PC at a friends house, but because I have a MacBook I don’t have direct access to GTA V itself, so I dug up some research and discovered that the best way (except for buying a PC which is way too expensive for me) is to download Bootcamp, so I did that, bought GTA V on Steam and followed all instructions to download LSPDFR and other mods (ex. Stop The Ped). The problem is I manage to start GTA V and launch LSPDFR, I manage to interrogate pedestrians and walk around the streets as a cop, but as soon as I start a chase or something that requires a lot of action, the whole screen goes black and I have to restart the computer. I don’t have a lot of storage (256 GB, about 20 after everything is downloaded +everything on Mac) should I buy external storage or what is the problem, can someone please help me?