Not sure why, but it won't show up under addons in game, so in order to play, launch the game with a normal campaign, and type /changelevel l4d2_re1mansionbeta
v2.5 (Complete) Instuctions: Requires L4D2 Add-on support installed (In Steam Tools) Double Click on VPK file to install or put in left4dead2/addons folder
Start in a small dark forest after your helicopter has crashed, fight your way to safety, then locate the school passed the grave yard, through the alleys and reach the Subway where your rescue will come.
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