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APPX_E_DELTA_PACKAGE_MISSING_FILE
APPX_E_DELTA_PACKAGE_MISSING_FILE means that the delta package does not contain a file required for the update from its baseline. A delta package must be internally consistent with the baseline it describes.
How to diagnose it
- Recreate the delta from the exact baseline and updated package artifacts used for release.
- Check that packaging, publishing, and CDN steps did not omit a file from the delta output.
- Avoid mixing files from independently built package versions when assembling an update.
Fallback to a complete package is safer than trying to supplement a released delta manually.
Microsoft: troubleshoot Windows app packages
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