If you are looking to install El Capitan legitimately, Apple provides it only as a DMG or APP file through the App Store’s "Purchased" section (if you previously downloaded it) or via Apple's official support page for older installers.
A more organized way to view all open windows, reducing desktop clutter. Mac Os X El Capitan 10.11 6 Iso Download
To download Mac OS X El Capitan 10.11.6 ISO, follow these steps: If you are looking to install El Capitan