Hi,
Sure I can help. Can you please share:
Troubleshoot Windows 11 upgrade and Installation errors - Microsoft Community
Let us check the following Logs to investigate why the upgrade to Windows 11 failed. Use a File sharing Website like Onedrive to share the files and post the link in the next response.
C:$Windows.~BT\Sources\Panther: File named Setupact.log records actions in the downlevel and SafeOS phase. As the log can be very large, the setup also creates a file named "Setuperr.log" that only has information about the errors encountered by the Setup to narrow the source of the problem.
C:$Windows.~BT\Sources\Rollback: File named Setupact.log records what happened after the update failed and Windows rolled back to Windows 10. The starting portion of the file may explain what happened and why the update failed.
Supplementary logs if present:
- Device Install Log in C:/$Windows.~bt\Sources\Rollback\setupapi\setupapi.dev.log
2**.** Setupmem.dmp present in C:$Windows.~BT\Sources\Rollback if the PC BSODed during the process.