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ERROR_INSTALL_FAILURE
ERROR_INSTALL_FAILURE is the generic Windows Installer fatal-error result. It reports that installation rolled back or could not continue, but it is not the root cause on its own.
How to diagnose 1603
- Enable verbose installer logging, rerun the same command, and inspect the action that failed before the final 1603 result.
- Check the target directory, the account and permissions used by the installer, available disk space, and whether the product is already installed.
- Preserve the full log and the exact package version; changing unrelated system settings before collecting it can hide the original cause.
Microsoft: error 1603 troubleshooting · Microsoft: Windows Installer logging
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