Apple no longer actively promotes El Capitan, but the download link still works via the Apple Support website.
This yields a clean, untouched ISO that supports any resolution, including 720p.
Connect a USB flash drive (16 GB or larger) to your Mac. mac os x el capitan 10.11 6 iso download 720p
Press Enter, type your Mac password, and wait for the process to reach 100%.
To install El Capitan, your Mac must meet these minimum specifications: : OS X 10.6.8 or later for upgrade. Memory : 2 GB RAM (4 GB recommended for better performance). Storage : At least 8.8 GB of available hard disk space. Apple no longer actively promotes El Capitan, but
If you are on a Windows or Linux machine and cannot run Apple’s .pkg extractor, you will need a pre-compiled .iso file.
Open the downloaded .dmg file and run the .pkg installer inside. This will place the "Install OS X El Capitan" app into your /Applications folder. Press Enter, type your Mac password, and wait
Since no direct "ISO" exists from Apple, you must create one. This is the safest method.
Once you have a valid macOS_10.11.6.iso file (6–7 GB), here’s how to use it: