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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.
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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