What to Do if Windows 8 Won't Complete Upgrade on Windows 8 Tablet or Suffice

On a Windows 8 tablet you can get stuck with a Windows 8 update. These steps can work.
  1. Switch your tablet account to a local account. You will change it back when you are done.
  2. From the desktop open Internet Explorer.
  3. Type MS-Windows-Store:WindowsUpgrade as the URL.