How do you properly install the NPC Animations addon?

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. So my question to you Facepunch is this, how do you properly install the NPC Animations addon?
The addon I am talking about is in this thread:
http://www.facepunch.com/showthread.php?t=353858&highlight=npc+animations

Can I please get some help? I see alot of movies in gmod using this script, I want to know how yo properly download this so please can I have some help?