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OS X El Capitan - Technical Specifications at Apple Support ().Apple Announces OS X El Capitan with Refined Experience & Improved Performance, Apple Inc.
#MAC OS 10.11 EL CAPITAN UPGRADE#
OS X El Capitan was officially launched on September 30, 2015, as a free upgrade through the Mac App Store. The first public beta was made available on July 9, 2015. The first beta of OS X El Capitan was released to developers shortly following the 2015 WWDC keynote on June 8, 2015.
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Following the California landmark-based naming scheme introduced with OS X Mavericks, El Capitan was named after a rock formation in Yosemite National Park. It is the successor to OS X Yosemite and focuses mainly on performance, stability and security. OS X version 10.11, also known as " El Capitan" ( el-kap-ɪ-tan), is the twelfth major release of OS X, Apple Inc.'s desktop and server operating system for Macintosh computers.