softwareupdate --fetch-full-installer --full-installer-version 10.11
Once the "Install OS X El Capitan" app is in your Applications folder, follow these steps: Plug in a USB drive (at least 16GB) and name it and paste this official command: mac os x 1011 el capitan iso download link
Recovery and Internet Recovery: Macs that shipped with El Capitan (or earlier) can often reinstall their original OS via Internet Recovery (hold Command+Option+R at startup) which downloads an Apple-signed installer directly. Simply rename it to ElCapitan
host full installer apps, though these should be used with caution and verified for integrity. Essential Technical Requirements : If creating a physical bootable drive, you need a minimum 8GB thumb drive formatted as Mac OS Extended (Journaled) GUID Partition Map Compatibility Safety Warning: Avoid Third-Party Sites
The file will appear as ElCapitan.iso.cdr on your desktop. Simply rename it to ElCapitan.iso .
For a virtual machine ISO, you may need a conversion tool like or specialized scripts to create a bootable .iso from the .app contents.
2GB of RAM and at least 8.8GB of available storage space. Safety Warning: Avoid Third-Party Sites