Have a specific issue? If the game crashes on the "Portent" mission, turn off "Frame Buffer Lighting" in the graphics options. That is a fix for the legitimate version only; cracked versions cannot solve that bug.
. The GOG version is favored by some users because it is DRM-free and includes all DLCs. iOS (App Store) XCOM- Enemy Within -Normal Download Link-
Pirated versions cannot access the "Long War" mod, which is widely considered the definitive way to play. Have a specific issue
– Direct digital purchase from the publisher. For Mobile Devices XCOM- Enemy Within -Normal Download Link-
High-quality mobile ports are available for iOS and Android. Technical Requirements