To install, place the sound and models folders to:
C:\Program\Steam\steamapps\username\half-life 2\hl2

And then open the color_variants.rar, select the color you want and place the material folder inside to the same place.

Credits:

Dr. Zoidburg (aka Lain) - Animations & Sound

Timittytim - Model, UV, Textures

Simonsyndaren - Hack

IppE - Render