 On November 21 , 2010 Microsoft sold the game including its two expansion packs as a part of its relaunch of its Games for Windows Live platform for 10 cents or 10 Microsoft points . The overwhelming and unanticipated demand created a shortage of account keys leaving some of those who had purchased the game through the promotion unable to install the game . Microsoft remedied this issue by assuring all customers who purchased the game that account keys would be generated within one week and automatically uploaded to each profile . As a result of this promotion the overall sales of the game have sharply increased . 
