From the steam community thread
http://steamcommunity.com/app/200510/discussions/0/828925849317558670/
http://www.greenmangaming.com/s/gb/en/pc/games/strategy/xcom-enemy-unknown/
code GMG30-DPLIM-DN831
http://steamcommunity.com/app/200510/discussions/0/828925849317558670/
http://www.greenmangaming.com/s/gb/en/pc/games/strategy/xcom-enemy-unknown/
code GMG30-DPLIM-DN831