Hi @JamesB,
Most of the time Windows 10 Failed to upgrade to the next or previous version because of unsupported third party software or Windows driver. To avoid this issue try to uninstall some of your third party software and the Windows driver particularly graphic driver from the PC and try again to upgrade your PC.
Uninstall Windows 10 Software:
- In the search box on the taskbar, type Control Panel and select it from the results.
- Select Programs > Programs and Features.
- Press and hold (or right-click) on the program you want to remove and select Uninstall or Uninstall /Change. Then follow the directions on the screen.
Remove Windows 10 Driver:
- Start Control Panel, click Hardware and Sound, and then click Device Manager.
- Expand the node that represents the type of device that you want to uninstall , right-click the device entry, and click Uninstall.
- On the Confirm Device Removal dialog box, click OK to start the uninstall process.