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Has anyone else tried applying the 2.3.0 test realm patch? The downloader verifies the patch, it starts patching in the WoWTest directory, then it gives the following error:

An error was detected while verifying the contents of the file "C:\Program Files\World of Warcraft\Data\enUS\backup-enUS.MPQ". There may be a problem with your system, or with the drive at C:\. You can try updating again. 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.
To check this installation for errors, click the "Repair" button. The Repair tool can automatically fix many update errors.