This is signed by Apple using its system installation certificate. Instead, it creates a new folder at /Library/Bundles, and installs a small bundle there named OSXNotification.bundle. It only appears to have been pushed out to Macs running versions of macOS prior to High Sierra.Īlthough listed in Installations as macOS Installer Notification, that is not what is actually installed. In this case, Apple appears to have used it to download what looks like promotional material, to nudge those not yet running High Sierra to install the upgrade.

Apple has used it in the past to distribute important fixes to bugs in various versions of macOS/OS X. When your App Store pane is set to Install system data files and security updates, you normally expect it to receive security updates, such as those for Gatekeeper, XProtect, MRT, etc., which I announce here, and urgent system patches.

In case you’re puzzled, this is the best explanation that I can give. You may have noticed that yesterday, 8 November, your Mac installed a silent pushed ‘update’ from Apple, named macOS Installer Notification.

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