paveyyyy

I installed this one like I did with every other (extract to addons folder). But it does not appear in the addons tab at character screen. Every other addon I have appears here apart from this one. Any idea why? Is there another way to install?

I tried a couple of addons that supposedly work for vanilla but the "/npcscan" ect just tells me to type /help for commands. Npcscan shows in addons in the character page but the commands don't work in-game. Is this a problem with my WoW or because npcscan does not work in vanilla? I also tried silverdragon but same results. Thanks