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ERROR_INSTALL_USEREXIT
ERROR_INSTALL_USEREXIT means that the installation ended because the user cancelled it. It is not evidence that Windows Installer found a package or system error.
Record where cancellation originated: installer UI, deployment system, shutdown, or an external process. Automation should distinguish an intentional user exit from package failure so it does not report misleading repair or compatibility errors.
How to interpret it
- In an interactive installation, check whether the user pressed Cancel or closed the installer UI.
- In automation, record whether an external UI handler, wrapper, deployment tool, or timeout sent a cancellation request.
- Do not treat 1602 as a successful install; confirm the product state before scheduling a retry.
Microsoft: Windows Installer error codes · Microsoft: custom action return values
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