Updating operating systems for the mac

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The Apple website says that “Apps [downloaded] from the Mac App Store may be used on any Macs that you own or control for your personal use.” This is however easier said than done.

You download a 5 GB Mac OS X installer from the App Store, the machine restarts, your system is upgraded to Mac OS X Yosemite or El Capitan but wait, where has the installer disappeared?

Apple's effort to expand upon and develop a replacement for its classic Mac OS in the 1990s led to a few cancelled projects, code named Star Trek, Taligent, and Copland.

Although they have different architectures, the Macintosh operating systems share a common set of GUI principles, including a menu bar across the top of the screen; the Finder shell, featuring a desktop metaphor that represents files and applications using icons and relates concepts like directories and file deletion to real-world objects like folders and a trash can; and overlapping windows for multitasking. It was noted as easy to use and featured cooperative multitasking for most of its history, but it was criticized for its limited memory management, lack of protected memory and access controls, and susceptibility to conflicts among extensions.

The current mac OS is preinstalled with every Mac and is updated annually.