My game was crashing on launch with a err_fil_pack_3 error but I fixed it by moving the files in windows explorer and not in openiv. Commenting in case somebody else has the same issue. Amazing pack! Love it!
I'm using Beren's LSPD textures at the moment with these models and the only extra thing I had to do was to replace the window texture on the CVPI (Police) with the one from the unmarked CVPI (Police4)