You could just update using the Blizzard installer! It's in the folder WoW is in, its called launcher or something I think.... or play...
It's not the one you use to play WoW normaly though!
Alternatively, if you wanted the patches you could go on WoWwikiw on the patches page, http://www.wowwiki.com/Patches
If you happened to download the cool blackrock toolbar I made, then you'd have got the link to wowwiki! XD lol Sorry, I just love shamelessy advertising my stuff/guild. And by guild I mean the Blackrock Clan!