Was the same with mine. Just try running the launcher instead of wow.exe. there was another 1.6gb to download for me after the 5.2gb patch but it would only install if you ran the launcher.When it gets half way and the progress bar turns green you can close it and load wow.exe and play, it will then grab whatever else you need whilst you are playing.nearly 61 now btw :p
Yep, that worked, after a few tries.Thanks.
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