I cannot get the 3.1 patch installed. Every time it stops at the error,
The update could not be applied.
The file "\base\world\maps\Kalimdor\Kalimdor_30_21.adt" could not be opened. If this problem persists, you may be able to solve it by uninstalling and then reinstalling the game. If you are unable to correct this problem, please contact Blizzard Technical Support. (InstallerFile::Open)
To check this installation for problems, click the "Repair" button. The Repair tool can automatically fix many update errors.
I can repair the installation, run the game again and same thing happens.