For older hardware that cannot run modern browsers, you may need to use a browser like Firefox ESR to successfully initiate the download from Apple's servers. create a bootable USB installer using the Terminal once you have downloaded the app? How to download and install macOS - Apple Support
: Double-click the InstallMacOSX.pkg file inside the disk image.
Downloading the .dmg does not immediately give you the installer app. You must extract it first: Mac Os X El Capitan 10.11.6 Installer Dmg Download
If you have a Mac that ever downloaded El Capitan in the past, you can use softwareupdate :
Erase the internal drive for a clean installation. For older hardware that cannot run modern browsers,
Select Install OS X from the main utilities menu and follow the on-screen setup prompts. Troubleshooting Common Errors
The full installer DMG is approximately . After extraction, the installation process requires about 8.8 GB of free space on your startup disk. Downloading the
Open the Terminal application via .
: This approximately 763.9 MB update further enhances OS security for El Capitan users.