Unzip the file into your "c:\program files\World of Warcraft\Patch" directory. It should create a sub directory. Then just run WoW and it should detect the patch and install it.
ahh...how i missed the good old, "blah to blah scheduled maintainence, errr, we need 5 more hours, but still, your server isn't actually going to let you log on, so we'll need to do rolling restarts, but that won't actually fix anything" days.
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