[Peregrine]

Ok, need a bit more here... did you install it correctly? Are other things in the mod showing up, just not the npcs? Are they all placed correctly (not inside walls, 100 miles up, etc)?

[Kethruch]

Open your mod and check to see that your NPCs have been placed on the ground. It's pretty easy to think they're on the ground when they are actually in the stratosphere. One way to check is to click on the NPC, (this should give his location in the 3-d coordinates - this should help if you know how to use them), and click view then isometric. This will allow you to look around the NPC to make sure that he is on the right floor and not in the basement or on the roof.

[Theta Orionis]

After dragging your NPC into the render window press F to make them fall into the world - this will drop your NPC to the surface below it.

If you placed your NPC too high initially it may end up on the roof, if too low it may fall through the floor. Dropping objects outside walls or even into walls is a favourite trick of the CS.

Open your mod in the editor, and check in the cell window whether your NPCs are listed as objects for the cell. Then double-click on each NPC to zoom in - that way you can check that they are positioned correctly.