I am also unable to get the update to finish loading.
My update will sit for hours at like 95%-98% complete... I have tried a number of things, mostly involving uninstalling and reinstalling the game... none of it has worked so far.
This seems to happen every time I have to update the game... it's becoming quite frustrating.
I'm running on a PC with pretty good hardware... so I would not expect that to be it...
I'd love to get this running again though, especially if it keeps this from happening again next time.