Run WoW like normal people, don't launch it from keyclone. Out of habit I fired up keyclone to start WoW and begin patching and now I'm getting all sorts of errors. Even screwed up my symlink. I have no idea if the two are related but it makes more sense to run it from your base install.

UGH!

Anyone else getting:

The file "\base\signaturefile" 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 ran the repair tool but still getting this error.

[UPDATE] Quick search seems to suggest running Updater as administrator will fix the issue. Doing that now.