However, if you are planning to update your Mac to OS X El Capitan, your device must fulfill the following requirements. Improved window management, quick and responsive interface, spotlight search, and enhanced graphics were the prerequisites of El Capitan OS. OS X El Capitan (10.11) was launched on 25 September 2015, and it is an improved version of OS X Yosemite (10.10). Is OS X El Capitan Still Available for Your Mac? Recover Lost Files After OS X El Capitan Update.Is OS X El Capitan Still Available for Your Mac?.