License key is affecting the Workstation upgrade – If you’re experiencing this issue while attempting to upgrade a workstation machine to Windows 11, chances are you will be able to avoid the error by changing the current license key to a generic PRO equivalent.A lot of users that faced this issue while using the WUA utility have finally managed to complete the upgrading process by upgrading directly by mounting a compatible Windows 11 ISO or by using the Media Creation Tool. Windows Upgrade Assistant glitch – Ironically for a utility that was developed for the sole purpose of upgrading older Windows operating systems to Windows 11, the Windows Upgrade Assistant has the least success in doing so.In this case, the error is most likely occurring due to a conflict between Virtual Box or VMWare and the Hyper-V functionality. Conflict with Virtual Box or VMWare tool – If you have either Virtual Box or VMWare tool installed on your older Windows version, you’ll need to take the time and uninstall the utility altogether before using the Windows Update Assistant to upgrade to Windows 11.

Win11 upgrade assistant