I had the same problem as you when dling the demo. At around 77% the download just stopped. I had to reactivate (without restarting the program actually). The only thing that changed was my screen saver (basic vista ss) started. PC didn't go to sleep or anything. And it's not like I haven't dl things like Kingdoms off D2D in the past, so I know it's not something with my comp. Has to be something with the steam app. Overall the dl was quite quick though.
Fortunately I've reserved my copy from EB Games and wont have to dl the whole thing... so um gl to you?
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