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ERROR_PATCH_TARGET_NOT_FOUND
A valid MSP is not universally applicable
ERROR_PATCH_TARGET_NOT_FOUND (1642) means Windows Installer could not find an installed target accepted by the patch. MSP applicability is derived from embedded transforms and target metadata such as ProductCode, product version, language, upgrade information, and prior patch state.
The application may be installed under the same display name but belong to another release channel, architecture, language, or major-upgrade ProductCode. Applying patches out of the vendor's required baseline can produce the same result.
Compare patch and product identity
- Extract the patch target information and accepted ProductCodes.
- Enumerate the installed product's ProductCode, version, language, and context.
- Check whether a prerequisite service pack or earlier patch is missing.
- Verify x86/x64 and localized package selection.
- Do not force an MSP onto an unmatched MSI database with administrative tools.
- Use the vendor's complete update chain when the patch is not cumulative.
References
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