~3.76 GB in my Windows~BT folder. 2.746 GB esd file. On my desktop PC. On my laptop the Windows~BT folder is only 57 MB, and no esd file. Both are running Windows 8.1 Pro x64.
Other than 140 MB in the $Windows.~BT folder, the 2nd and possibly the main ISO (over 2 GB) is being copied to this folder - C:\Windows\SoftwareDistribution\Download\0ef3a7b4ab9df805ef65cf251975f3c6
So if your C:\$Windows.~BT folder's size remains unchanged check in the Software Distribution folder.
I have 3 Win 7 computers that are turned on right now - one has finished the download (just under 6 gig for some reason) and one of the others has started, while the third has nothing yet.
Yes, I've just checked C:\Windows\SoftwareDistribution and the DOWNLOAD folder is 2.70 GB of size.
Anyway... when my download rate dropped so dramatically, down to zero, and after waiting a bit, I have rebooted. Nothing happened. I logged into my Win 7 64 bit Home Premium again. Right now it is downloading something again but at the very low rate of 60 - 80 KB/s.
I do not mind. I was not expecting any Upgrade today, anyway.
Don't have it yet. Although, I looked on my PC's this morning, and it said it had failed an update. I'll post a screenshot later of a better description of what I am talking about.