Verizon fios, just WTF are you doing? Since the release date, I have not been able to download iOS 8. At work, it was downloaded in minutes. I can download it across the VPN at 3MB/s. But directly downloading from Apple? 5-6 days? WTF Verizon?!
Try downloading another file directly from Apple. Pick an earlier IPSW and a completely unrelated file (an OS X application DMG). See what happens.