These are the American Civil War: Brothers vs. Brothers 3.6 Open Beta manual install files
(Windows only, no Mac!)
Detailed install info here: Twcenter.net
Current build of 3.6 Open Beta supports Warpath map based ACW campaign only.
However, users who don't own Warpath can still play the custom battles and a limited RTI campaign with all the new units!
Also, remember this is a BETA of 3.6, so several features aren't working and the installation is not smooth. Unfortunately there is also a likely campaign crash present, but you can use older campaign files for a more stable build.
For all additional info, go to the forum: Twcenter.net
PLEASE DON'T USE COMMENTS BELOW HERE FOR TECH SUPPORT QUESTIONS. USE THE FORUM INSTEAD Twcenter.net
Reduce the chance of battle crashes by turning down your graphics settings and disabling Steam overlay.