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WU_E_UH_CUSTOMINSTALLER_INVALID_SIGNATURE
WU_E_UH_CUSTOMINSTALLER_INVALID_SIGNATURE means the custom installer package or stub did not match the signature expected by the update metadata. This points to an integrity or content mismatch problem.
What to check
- Obtain the update content again from the trusted source instead of reusing copied files.
- Check whether the issue affects only one machine or all machines receiving the same content.
- Review related trust, catalog, or package verification messages earlier in the logs.
Microsoft: Fix Windows Update corruptions and installation failures
Microsoft: Windows Update log files
Microsoft: Windows Update error reference
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