Installing the Latest Mac OS X
Installing OS X works differently because you can only get the disk image from the App Store, and you can only access the App Store from OS X. This system works for most people because Macs come with OS X, and you can upgrade to the latest version by purchasing it from the App Store and double-clicking the installer. You must own a license for an OS X version compatible with the upgrade to the latest version; check your version number by clicking the "Apple" menu and selecting "About This Mac." For advanced users, Apple includes a bootable disk creator with new installation images. If you're comfortable entering commands in a terminal, you can refer to the Apple website for the commands to create a bootable medium from the installation image.
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