Unfortunately, Apple doesn't provide a direct download link for OS X El Capitan ISO files. However, you can obtain it through the Mac App Store or other legitimate sources.
Creating a bootable USB drive for emergency system recovery. System Requirements for OS X 10.11
Running legacy software that is incompatible with newer macOS versions.
# Create a blank disk image (6GB is sufficient) hdiutil create -o /tmp/ElCapitan -size 6g -layout SPUD -fs HFS+J -type SPARSE
sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/install_build --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app
Unfortunately, Apple doesn't provide a direct download link for OS X El Capitan ISO files. However, you can obtain it through the Mac App Store or other legitimate sources.
Creating a bootable USB drive for emergency system recovery. System Requirements for OS X 10.11 os x el capitan download iso
Running legacy software that is incompatible with newer macOS versions. Unfortunately, Apple doesn't provide a direct download link
# Create a blank disk image (6GB is sufficient) hdiutil create -o /tmp/ElCapitan -size 6g -layout SPUD -fs HFS+J -type SPARSE os x el capitan download iso
sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/install_build --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app