https://www.techradar.com/news/computing/apple/mac-os-x-10-11-revealed-with-osx-el-captain-1295833
Mac OS X 10.11 revealed with OS X El Capitan | TechRadar
Jun 8, 2015 - Ushering in a new OS X
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https://thehackernews.com/2015/06/mac-os-x-10.11-el-capitan.html
Apple Mac OS X 10.11 'El Capitan' Update unveiled at WWDC 2015
Apple releases Mac OS X 10.11 'El Capitan' Update at WWDC 2015.
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