Windows 10 upgrade to Windows 10 Home, version 1511, 10586 is stuck at 2. What should I do?

[Windows Central Question]

Windows 10 upgrade to Windows 10 Home, version 1511, 10586 is stuck at 2%.

This is the fourth day at 2%. One day I checked it said "error" but that is not showing now. What should I do?

 

[rkarolak]

You may want to run the Windows Update Troubleshooter, if you haven't.