This model consists of a .vpk file, for those who don't know how to install a .vpk file, see the instructions below. Instructions: The file is in the "VPK" format, you just need to drop it into the folder: "...Counter-Strike Sourcecstrikecustom" If it still doesn't work, then you already have there is this type of file outside the VPK file and should be deleted prematurely.