Must be running OS X 10.6.8 (Snow Leopard) or later to upgrade directly. 2. Official Download Link
Obtaining the Mac OS X El Capitan 10.11.6 installer is essential for maintaining older hardware that cannot run newer macOS versions. Use this guide to safely download the official disk image ( ) and prepare it for installation. 1. System Compatibility Check Mac Os X El Capitan 10.11.6 Installer Dmg Download
Apple provides the El Capitan installer outside the App Store as a direct download. Apple Support Direct Link: Access the Official Apple Support page Must be running OS X 10