If you want a more legit/safer way to get the textures, you can download a CSS server with SteamCMD and mount the server to your gmod.
You can't download CS:S with SteamCMD, you have to mount CS:S on SteamCMD and you need to have CS:S bought on your Steam account in order for it to work.
If you want a more legit/safer way to get the textures, you can download a CSS server with SteamCMD and mount the server to your gmod.
You can't download CS:S with SteamCMD, you have to mount CS:S on SteamCMD and you need to have CS:S bought on your Steam account in order for it to work.
You can download a CSS server and mount it, I've done it multiple times.