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How to install add-ons for Alien Swarm.
Installing Alien Swarm Add-ons
Step 1: Download the add-on. All downloads are in .zip format. (You need to open the .zip archive to access the .vpk file.) If you can not open or extract the .zip/.rar file, download and install winrar for free. Step 2: Install the add-on. Copy the .vpk to your Alien Swarm add-on directory. If this folder does not exist, create this folder. \Steam\steamapps\common\alien swarm\swarm\addons\ You can remove add-ons by deleting them from your /addons/ folder.
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