The latest retail patch is v1.3 for both Windows and OS X. Digital distribution versions are already fully patched.
Owners of Windows-only retail special editions can download the OS X Installer. The Windows install DVD is required.
Worldmerge combines the originally separate world areas of the main campaign, multiplayer maps and Pirates of the Flying Fortress DLC into a unified world with many additions and balance changes. This mod requires the Pirates of the Flying Fortress DLC.