Installer packages are failing to install on macOS26.1

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premak OP
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Hi, We use Flat package installers (.pkg based installers) to install our applications on macOS. In macOS 26.1, installation is failing with the error

Unable to use PK session due to incompatible packages. Terminating. 2025-11-03 14:22:36+05:30 Admin-3 installer[1160]: Install failed: The Installer could not install the software because there was no software found to install.

Same installer package is working on macOS 26.

Any help is greatly appreciated.

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Installer packages are failing to install on macOS26.1
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