If you dont want to spend hours of downloading the patch threw blizzards downloader go to:
FZ :: Filarkiv :: wow-2.3.3.7799-to-2.4.0.8089-engb-patch.exe
and press the big red button.
If you can speak swedish you can even register to use the site for other things too
Hope it helped, i got it down in 5minutes with 24mb line.