Edited by Lurdlespor on 18/04/12 09:24 (BST)
If you are currently testing the 64-bit client, in order to patch the game you will need to remove the 64-bit files to allow the patch process to complete.
With the 64-bit client files in place you may receive errors such as : Blizzard Updater failed with an internal error. or the Play button may stay Grey on the Launcher.
Simply delete the 64-bit files listed below from the World of Warcraft folder, and the patching process will resume after going through a short repair process.
World of Warcraft-64.app
A new version of the 64-bit client files will be required as well. Please keep an eye on the 64-bit client forum thread for updated files: