Apple announced El Capitan the latest version of it’s OS X operating system, numbered 10.11, on the 9th September 2015, at the Bill Graham Civic Auditorium in San Francisco, California in the United States.
This is the third in a departure from the previous naming of operating systems after big cats. Following on from OS X 10.9 Mavericks and 10.10 Yosemite, El Capitan continues with the new naming convention of locations in California.
In this tutorial, I’ll show you what you will need to do to ensure that a Mac is ready for upgrade, from OS X 10.10 Yosemite, or earlier, to OS X 10.11 El Capitan following its release on 30th September 2015.