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http://my.lotro.com/referral/AxisofLint
How to install custom maps and campaigns. (.vpk) - Step 2
Double click the .vpk file to have Steam automatically install the custom map / campaign. If you are prompted to select what program to open the file with; Right click on the .vpk and select "Open With...". On the next window press "Browse" and look for Steam's 'addoninstaller' in your left 4 dead installation directory.
\Steam\steamapps\common\left 4 dead 2\bin\addoninstaller
To manually install add-ons (.vpk), follow the steps below.
Navigate to your left 4 dead or left 4 dead 2 directory. If this folder does not exist, create this folder.
\Steam\steamapps\common\left 4 dead 2\left4dead2\addons\
Once you have found / created your addons folder; copy and paste the .vpk files into this folder.
After your .vpk file has been copied to this folder it has been successfully installed.
http://www.l4dmaps.com/install-maps.php#install