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ERROR_UNKNOWN_COMPONENT
ERROR_UNKNOWN_COMPONENT means that Windows Installer could not resolve the requested component identifier. MSI components are identified separately from products and features, so a valid ProductCode does not make every component reference valid.
Capture the component GUID exactly as supplied and query it in the same user or machine installation context as the product. Stale deployment metadata can reference a component that belonged to another product revision or context.
What to check
- Verify the component GUID or identifier passed to the MSI API and the installation context used for the lookup.
- Confirm that the product which publishes the component is actually installed or advertised as required by the operation.
- For package authors, compare the Component table and related feature mapping with the identifier used by the application.
Microsoft: Windows Installer error codes · Microsoft: Installer function reference
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