: Corrupted temporary files can cause the launcher to hang. Press Windows Key + R , type %programdata% , and delete the Battle.net and Blizzard Entertainment folders.
Once you complete these steps, that loading bar will flash for three seconds, and you will finally hear the glorious sound of the Battlecruiser reporting for duty. Stop waiting. Start playing. starcraft ii preparing game data
A timeless classic of frustration. Would not recommend, but we all keep playing it anyway. : Corrupted temporary files can cause the launcher to hang
In Battle.net launcher: