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| WU_E_INVALID_INSTALL_REQUESTED | WU_E_NOT_APPLICABLE |
WU_E_INSTALL_NOT_ALLOWED
WU_E_INSTALL_NOT_ALLOWED means that WUA tried to install while another installation was in progress or while the system was pending a mandatory restart. It is an operation-state conflict.
How to resolve it
- Allow the active installation to finish and reboot if Windows requires it.
- Do not start a second installation workflow to work around this status.
- After the system returns to a stable state, create a new update session and re-evaluate applicability.
Two different machine states share this HRESULT
The documented causes are an installation already in progress and a mandatory restart that is still pending. Those states require different evidence: active-operation tracking for the first, and reboot completion for the second. Before retrying, preserve the update events around the failure and the result of the preceding installation so the automation does not mislabel every occurrence as a generic servicing corruption.
Starting more WUA installer objects in parallel cannot bypass the restriction. After the active operation finishes or the required reboot completes, create a new session and search again. That avoids carrying an update collection across a machine-state transition that can change applicability and reboot behavior.
References
References
- Microsoft: IUpdateSession
- Microsoft: IInstallationResult and per-update results
- Microsoft: Windows Update log files
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