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APPX_E_DELTA_APPENDED_PACKAGE_NOT_ALLOWED
APPX_E_DELTA_APPENDED_PACKAGE_NOT_ALLOWED means that a delta package using an appended-package form was supplied to an operation that does not support it. The package may be valid for another workflow, but not for this one.
What to check
- Confirm the update API and deployment scenario support the type of delta package being distributed.
- Use the package form expected by the target Windows version and servicing workflow.
- Test the same package through the intended production update path rather than through a different tooling mode.
The correction is to align package format and operation, not to bypass package validation.
Microsoft: troubleshoot Windows app packages
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