Linksil wrote on Oct 21, 2010, 13:54: Yea the wow installer is horrible. You need double or more free space to the size of your game for the install. You download 6 gigs of patches, then they copy the whole game while overwriting the old one. Don't know why they can't just patch one file at a time and need oh say 10mb free space?
Ya that update process completely killed my attempt at applying patch 4.01. Instead I had to uninstall the game and reinstall it using the new launcher / updater (found under a sub menu of your Battlenet account page, i.e. Full Game Install).
My assumption is that everyone should have the new launcher / updater now, so adding Cataclysm should be a "streamed" process rather than a downloaded patch update (assuming you purchase the online version).
BTW since I did a complete reinstall using the new launcher / updater, my WoW folder uses only 21.8 GB of space.