Apple has released a new security update for OS X Yosemite and El Capitan, or OS X 10.10 and 10.11, the operating system released two years and one year ago.Apple hasn’t yet detailed what security fixes are included beyond these release notes: The update could be related to recent security vulnerabilities detailed in the news or routine maintenance for older versions.
When downloading updates in the Mac App Store, it’s a simple thing to start and pause your download.
Marking the 12th major release in Apple's annual OS release cycle, version 10.11 El Capitan is an extension of the previous version of OS X, Yosemite, in that it focuses on adding stability, performance, and security enhancements to the already rock-solid UNIX foundation.
To help IT support staff, systems administrators, and enterprise users get up to speed on OS X El Capitan, the most important details and related resources have been compiled into this guide, which we will update as new information becomes available.
Here's how Apple says you can upgrade via their mac OS upgrade page. If you’re running Snow Leopard (10.6.8) and your Mac supports mac OS Sierra, you will need to upgrade to El Capitan from the App Store first. If you’re running Leopard and would like to upgrade to mac OS Sierra, first you’ll need to upgrade to OS X Snow Leopard.
You can purchase OS X Snow Leopard from the Apple Online Store.