Alien Swarm : Reactive Drop
Alien Swarm: Reactive Drop is a freeware multiplayer top-down shooter video game by the Reactive Drop Team.
How to install add-ons for Alien Swarm: Reactive Drop
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Installing Alien Swarm: Reactive Drop 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: Reactive Drop add-on directory. If this folder does not exist, create this folder.
\Steam\steamapps\common\alien swarm reactive drop\reactivedrop\addons\

You can remove add-ons by deleting them from your /addons/ folder.
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