How do you properly install the NPC Animations script?

I have tried making new folders and putting them in there, I tried making new text file documents and others but they don’t work, I still get the ‘unknown command’ label and now I am running out. I posted this in the video section because I thought it would be appropriate as alot of people here managed to make movies using it.
The addon I am talking about is in this thread:
http://www.facepunch.com/showthread.php?t=353858&highlight=npc+animations
I really need some advice on installation of this, the tutorial in the thread isn’t thorough enough so I’m clueless on it. Are there files that are in addon format? If not then what is the proper installation method on this script. Please reply, I want help on this.

Will someone please help? I’m still trying to install it but it just fails.

Essentially the entire path would be similar or somewhat close to:
C:/Program Files/Steam/steamapps/yoursteamname/garrysmod/garrysmod/lua/autorun/server