If windows upgrade fails, like with a blue screen of death, it flashes the error a minute or so, and then rolls back the upgrade.
The error shown may not have much details and in most cases will not help figure out what went wrong.
In such cases SetupDiag can be of help
In latest version of windows upgrade install, SetupDiag runs automatically after upgrade failures. The results can be found in below location
%windir%\logs\SetupDiag\SetupDiagResults.xml
This log is in a much more understandable format compared to pouring over all the setup log files
More about SetupDiag and how to manually run this tool, please see here
Note:
Most of the time, upgrade failures are due to driver compatibility issues. In such a case, you should be able to see the driver details and dll linked to it in the above log file. Once you know which driver is causing issue, you may want to open windows "Device Manager" and completely un-install the device before attempting upgrade again
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