Window 11 upgrade has failed error code 0x8007007f

Hi willk7 

1. Open cmd in elevated mode, right-click on Command Prompt icon, and select Run as administrator.

2. Please execute the below commands step by step:

sfc /scannow
dism /online /cleanup-image /scanhealth
dism /online /cleanup-image /restorehealth

The first command will scan and fix system file corruption issues, second and third command will use DISM (Deployment Image Servicing and Management) tool to scan/restore the health of the windows installation image. 

3. Reboot the computer and run Windows 11 Upgrade

I hope these steps could be helpful for you, please do not hesitate to contact me for any further assistance.