Ancient Ruins campaign with bloom fix and a working DL link to Mod DB.
VMF files are included in VPK. Level designers feel free to improve these maps and make a new version of campaign.
Automatic. Extract the VPK addon file from the archive and double click it.
Manual. Extract the VPK addon file from the archive and copy it into your "addons" folder:
C:\Program Files\Steam\SteamApps\common\alien swarm\swarm\addons\
C:\Program Files (x86)\Steam\SteamApps\common\alien swarm\swarm\addons\
Discussion, bugs, suggestions: