Once you have the official InstallMacOSX.dmg or the Install OS X El Capitan.app :
Before we discuss the , let’s address compatibility. You should only install El Capitan if: Mac Os X 10.11 El Capitan Iso Download
If you have access to a Mac with Mac OS X 10.9 Mavericks or later, you can download El Capitan from the Mac App Store: Once you have the official InstallMacOSX