Window 11 upgrade has failed error code 0x8007007f

I actually ran into this issue as well when attempting to run the Windows 11 Installer Assistant, the problem was that the process would get to 71% and then error out with the Error Code specified in this thread.

Similar to GreaterShrew issue, I ran everything on my device to ensure everything was updated regarding Windows Update, drivers and so forth. Ran the SFC actions and DISM commands, but did nothing to resolve the issue.

One method that worked for me was running the installer program as an "Administrator", sounds dumb as our windows profile are set to administrators but right-clicking the program and selecting "Run As Administrator" did the trick for me.

Otherwise, for anyone else that comes across this post at a later time, I would suggest the following as well:

Run the following commands in an Elevated Command Prompt:

SFC /scannow
dism /online /cleanup-image /scanhealth
dism /online /cleanup-image /restorhealth

Ensure all Windows updates are installed for your current OS build. Settings > Updates

Run the Windows11Assistant application as an Administrator

Reboot as necessary


Hope all this helps!!