macOS 15.6: Opened package is not the same at install time

Developer Tools & Services General
appleynamed OP
Created Aug ’25
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I've created an installation package and it is failing to install on macOS 15.6.

The package is, I believe, properly notarized, since it will install correctly on other macOS versions, including 15.5

The only clue I have is the output from installer:

installer[8015] <Error>: Opened package is not the same at install time installer[8015] <Debug>: Unable to use PK session due to incompatible packages. Terminating. installer[8015] <Error>: Install failed: The Installer could not install the software because there was no software found to install.

The installer consists of a a single "component" package, and the outer "product" package. The component package is present, and I can successfully run installer manually to install it, so I don't think the component package is corrupt.

Has anyone else encountered this? Are there any tools available to help me diagnose the issue? The logging is not helpful.

Replies  2
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Views  181
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DTS Engineer OP
Apple
Aug ’25

The fact that this works on 15.5 but fails on 15.6 is worrying, and it definitely warrants a bug report. Make sure you attach the notarised package that reproduces the problem to that bug.

Once you’ve filed your bug report, reply here with your bug number and I’ll take a proper look.

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

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appleynamed OP
Aug ’25

Thank you. I've created FB19416316, per your suggestion.

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macOS 15.6: Opened package is not the same at install time
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