How to install: extract the materials folder into your counter-strike 
source\cstrike directory located in "Program Files\Valve\Steam\SteamApps\(your username)"
the default ct_urban skin will be replaced when you start the game

How to uninstall: go to your "counter-strike source\cstrike\materials\models\player" 
and delete the ct_urban folder

if you have a problem or a question regarding the skin, email me 
at neo1989@sonic.net and I will try to help out.