OS X El Capitan (10.11), released in 2015, was designed as a "refinement" update following the visual overhaul of Yosemite. While it is now technically obsolete and no longer receives security updates, it remains a popular choice for revitalizing older Mac hardware. Download Information
Restore the installer data to the image:sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/install_build --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app --nointeraction download iso mac os x el capitan high quality
file ~/Desktop/ElCapitan.iso
Official Apple Support Page: Apple provides a direct download link for the El Capitan installer as a disk image (.dmg). You can find it on the Apple Support website. OS X El Capitan (10
InstallMacOSXElCapitan.app in /Applications.