I've run the free Windows 10 upgrade twice on my Windows 8.1 laptop. Both times, Windows 10 would download. As my system restarted the install would take place and system finishes restarting. However, upon hitting the splash screen, I was back to Windows 8.1. Not sure why the install is failing. Each time, I receive a failure in the Windows Update popup. Did not have this problem on my desktop going from Windows 7 to 10.