Odst npc help

I am having problems with getting some Halo ODST npcs (http://www.garrysmod.org/downloads/?a=view&id=110130) i downloaded them and extracted them into addons but when i went onto gmod there was no trace of them. I even got this (http://www.garrysmod.org/downloads/?a=view&id=110092) and this (http://www.garrysmod.org/downloads/?a=view&id=110409). still no trace on gmod. can someone tell me if i am doing something wrong? Also if someone figures out how to get them to work on my comp (Windows Vista) can you also tell me how to get them to hold and use this gun (http://www.garrysmod.org/downloads/?a=view&id=105354) Thanks! notify me if you have a solution.

ok well you got to open up the odst and odsts folder and place them in your garrysmod/garrysmod folder and over right the folders they don’t show up if you put the in addons

for the weapon me and nubble and ace did it and no it can’t be made into npc weapon just from that file it needs some editing