GFC error: There are 2 options: 1) Your mod folder has not the requiered name. The folder must have exactly the name which the installer suggests. If you changed it, then change it back. 2) You installed the mod in "My Documents\My Games\BtS\Mods", which is wrong. The mod has to go into "C:\Program Files\Firaxis Games\Civ\BtS\Mods".