Quote Originally Posted by 'zanthor',index.php?page=Thread&postID=188888#post 188888
On vista these files are downloaded to the users profile folder. The exact path is escaping me as I'm at work.

A brief google points to:
C:\Users\Public\Documents\Blizzard Entertainment\World of Warcraft\Updates

Which sounds right.
That's where it is. Thanks Zanthor.