What does HRESULT 0x8008020C (APPX_E_INVALID_APPINSTALLER) mean?

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The .appinstaller file is invalid and cannot be used to install or update the app package.

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APPX_E_INVALID_CONTENTGROUPMAP	APPX_E_DELTA_BASELINE_VERSION_MISMATCH

APPX_E_INVALID_APPINSTALLER

APPX_E_INVALID_APPINSTALLER means that the .appinstaller file does not meet the format or content requirements for the package installation workflow. It is separate from validation of the .msix or .appx payload itself.

Useful checks

Inspect the detailed event or tool output for the invalid XML element, URI, version, or package reference.
Verify that referenced package and dependency URLs are reachable and point to the intended signed artifacts.
Publish the corrected installer file with the corresponding package version and retest the update path.

Fixing the package alone will not resolve an invalid installer descriptor.

Microsoft: troubleshoot Windows app packages

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