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ERROR_INSTALL_OPTIONAL_PACKAGE_REQUIRES_MAIN_PACKAGE_FULLTRUST_CAPABILITY
ERROR_INSTALL_OPTIONAL_PACKAGE_REQUIRES_MAIN_PACKAGE_FULLTRUST_CAPABILITY means an optional package contains a FullTrust entry point, but the main package does not declare the required runFullTrust capability.
This is a package-manifest consistency requirement. Update the main package manifest and rebuild the entire related set; the optional package cannot supply the main package capability by itself.
What to check
- Inspect the main package manifest for the required restricted capability declaration.
- Verify that the optional package is part of the intended related set and that all package manifests were built from the same configuration.
- Retest on a supported Windows version and use the deployment log to confirm no other capability or trust requirement remains.
Microsoft: App package deployment troubleshooting
Microsoft: Full-trust desktop app package capability
Microsoft: Optional packages and related sets
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