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WU_E_COULDNOTCANCEL
WU_E_COULDNOTCANCEL means the operation had reached a phase where cancellation was not permitted. Installation, commit, or callback processing may need to complete or reach a safe boundary first.
What to do
- Do not kill servicing processes solely to force cancellation; that can leave update state inconsistent.
- Check the operation’s current phase in the Windows Update log and allow it to reach a supported completion point where possible.
- If a reboot is pending, complete it before attempting a new update transaction.
Microsoft: WUA success and error codes
Microsoft: Windows Update log files
Microsoft: Windows Update Agent API
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