I have exactly the same problem, and I’ve tried restarting the computer as well as redownloading the installer. Judging by other replies, it seems like it’ll fix itself. I might have bad internet, but not this bad.
Whenever I redownload my game cache it only takes a couple minutes… 
Not sure why it would be taking this long. Servers may be receiving a lot of downloads at the time and slowing it down.
Same here,0.1mb/sec or even 0.0.But now i think the servers were restarted and it s everything fine.
I am also downloading at very low speeds, around ~0.4 MB/s, my download speed in other applications tends to be around 50 Mb/s.