Help me!!!

Ok when i got to certain maps all i see is like purple squares and other error sign’s how do i fix this.

What maps?

Doesn’t really matter what maps, it means you’re missing textures and models that are from different games. If you want to be really safe, you should have:

Half-life 2
Hl2-ep 1
hl2-ep 2


Oh and since you’re new here, there is a help subforum.