Installing CSS Weapons on M9K Base problems.

Could someone walk me through installing for my server?
I tried putting it in addons, didn’t work.
I put the materials in /garrysmod/materials
I installed it the way you normally would but theres one problem, the kill icon is a purple checkerboard and so are the scopes.
Also the C4 explostion is a normal explostion.
If someone could help me out that would be sweet.

Have you taken a look at this?

Yes, i did that at first. But nothing works when i do use server workshop etc, i had to manually add it in /garrysmod/gamemodes/darkrp/entities/weapons

Are you sure you server is running DarkRP and not sandbox or something else?

Yeah everythings fine its just the weapons.

EDIT: Add me on steam,