models dont show up

I download a couple of maps and ragdolls and only some of them showed up. Some of the ragdolls I got don’t show up in the spawn ragdoll list or NPC list, and all the maps I downloaded have the word error everywhere! can anyone help?

For example I downloaded the left 4 dead survivors and they don’t show up in the spawnlist. What I meant to ask was for the ragdolls and maps to work to I need to have that specific game to be able to use them?

You only need the specific game if the addon does not contain the models.
For maps, you didnt install the needed models, or you installed the map wrong.
Most of these errors come from wrong installations.