Some Missing Textures from HF2: EP2

Not all of the textures from Half Life 2: Episode 2 are missing for me but quite a bit of them are. Only in Garry’s Mod, strangely. I bought the game legally and it seems that some textures are missing. Not sure if it’s just one or what, but in certain places I’m getting pink/black checkerboard. I could take a few screenshots.

(User was banned for this post ("Wrong section" - Gran PC))