The most secure way to download El Capitan is directly through pages. Apple provides a disk image (.dmg) file for older operating systems to ensure users can still upgrade their hardware.
Use the createinstallmedia tool (found inside the El Capitan app) to flash that blank image. Step 4: Convert the final .cdr file to a .iso format. Why Avoid Third-Party ISO Sites? mac os x el capitan 1011 6 iso download gratis work
Once you download the .dmg , open it and run the .pkg installer inside. This doesn't install the OS yet; it places the "Install OS X El Capitan" app into your Applications folder. Converting DMG to ISO The most secure way to download El Capitan