The campaign is currently pre-beta. It is playable from beginning to end, but still has some bugs and is not yet optimized. As such, the system requirements are substantially higher than those for the original campaigns.
At this time, please only report bugs that prevent you from finishing a level.
To install, decompress the file then double click goingballistic.rar. In some cases, this will not work. If this is the case, manually place goingballistic.vpk in the addons folder in your Left 4 Dead 2 folder.