About SetupDiag
SetupDiag analyzes a failed Windows upgrade and provides details about why the upgrade did not complete successfully. It is a diagnostic tool intended to help identify the cause of an upgrade failure so that administrators or users can investigate an appropriate remedy. The supplied description does not specify which upgrade versions are supported or how results are presented, so the information available depends on the logs and system state. SetupDiag focuses on diagnosing installation and upgrade problems rather than performing the upgrade or repairing every issue automatically. The report is intended to guide investigation of the upgrade failure. It returns information to guide a follow-up investigation.
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