Windows 8 Upgrade Assistant stuck at 0%

So I signed up for Microsoft's $14.99 upgrade earlier this month and finally got an email giving me my promo code and the go signal to download the OS. I ran the Windows 8 Upgrade Assistant, paid for it, and got my product key, but downloading of the actual OS is stuck at 0%. It's been like this for the last 12 hours. I've tried restarting the download, my laptop, and tried running the Download Windows app that comes with it in various compatibility modes to no avail. Help!