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WU_E_WUTASK_CANCELINSTALL_DISALLOWED
WU_E_WUTASK_CANCELINSTALL_DISALLOWED means the requested cancellation is not allowed for this installation path. The update was not started as a scheduled task that the task API can cancel.
What to do
- Do not assume that stopping a service or terminating a process is a safe substitute for a supported cancel operation.
- Let the current transaction reach a defined completion or failure state, then inspect the result and reboot requirements.
- For deployment software, distinguish scheduled work from direct install calls before exposing a Cancel action.
Microsoft: Windows Update log files
Microsoft: Windows Update error reference
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