Older discs will not have the latest version so we would advise updating the system software using one of the other methods when possible.
If your PS4 system is not connected to the Internet you can download the system software update to a USB storage device and copy the file to your PS4 in order to update the system.
The Mac App Store shows updates for Mac, not updates for i Phone, i Pad, or i Pod touch.
This would be done if your system software is corrupt and will not update using the other methods or to try and resolve other faults with the PS4 system.
You will need a USB storage device with at lease 900mb in order to download the update file.
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When playing a Play Station 4 format disc that contains a later version of the system software you currently have a screen will be displayed asking if you wish to update the system software.