Have this exact same issue. I’ve tried disabling firewalls, resetting my IE settings (what Tech Support told me to do), closing and opening the downloader, updating drivers (they were already up to date), and a few other crazy things I can’t even remember.
Update:
Problem fixed. Apparently you just have to let it sit there. It says it is 0.00kb/s, but it is slowly downloading. I just let it sit for about ten minutes and it finished.