So I'm going to elaborate a bit:
After 0.4 realeased, I used a clean copy of GTA I had already installed to install LSPDFR. Didn't work.
I uninstalled GTA and Social Club, and reinstalled it. I copied the installation folder and used the copy to install LSPDFR (I made sure to always keep the folder I was using named "Grand Theft Auto V"). And for one session, it actually worked fine. Then I closed GTA, restarted it via RPH, the launcher for some reason updated the game (although it was on 1604 before as well), and then the same crashing behaviour started again.
idk if this helps or not, but I thought I should tell you