Apple provides a disk image (.dmg) for El Capitan on their Support Site , which you can use to create an installer.
Alternatively, use softwareupdate or installinstallmacos.py (from Graham Pugh’s open-source tools) to fetch old macOS installers from Apple’s software catalog. macosxelcapitan10111imageiso work
Common reasons this keyword is searched: Apple provides a disk image (
If you don’t have access to a Mac, creating a working macOSXElCapitan10111imageiso is more complex, but possible using virtualization or recovery tools. macosxelcapitan10111imageiso work