Blizzard titles won't install on Macs with FileVault® or FileVault 2 enabled. To check for FileVault and FileVault 2, follow the steps below. 

  1. Select System Preferences from the Apple menu.
  2. Click on Security (Security & Privacy on Mac OS X Lion).
  3. Click on the FileVault tab.
  4. Check to see if FileVault is enabled.

If you need assistance with FileVault, contact your local Apple Authorized Service Provider.