This notation is frequently used in technical forums or software archives to identify a specific, legitimate installer file for older Apple computers. If you are trying to install this, I can help you find: for Mavericks. Instructions on how to create a bootable USB drive. Known issues with this specific 10.9.3 release.

The string refers to a specific version of the Apple macOS Mavericks operating system (version 10.9.3) .

Specifies that this version is for Intel-based Mac computers, as Mavericks was released well after Apple's transition away from PowerPC processors.

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