Apple has released the final version of OS X El Capitan on the Mac App Store. Those with compatible machines, that would be most Macs sold in recent years, should head over to the store and download the free update, which is just over 6GB in size. The default and simplest method is to just update your existing OS X installation but you could do a fresh install by extracting the installation file, burning it to a USB drive, and booting from it. OS X El Capitan brings many improvements, such as improved split-screen window management, improved Mission Control, updated Notes, Mail, Maps, and Photos apps, improved Spotlight search, pinned tabs in Safari, improved performance, and a new typeface - San...
Source: http://www.gsmarena.com/os_x_el_capitan_now_available_for_download-news-14256.php