Double-click the downloaded file to mount it on your desktop.
Once the OS X Utilities window loads, you can choose to run to completely wipe your primary drive for a clean installation, or select Install OS X to upgrade your existing environment without losing files. Troubleshooting Common Errors
Fixed issues with NetBoot imaging and Active Directory authentication. Enhanced overall security patches. Troubleshooting & Safety Mac Os X El Capitan 10.11.6 Installer Dmg Download
https://support.apple.com/en-us/HT211683
If you have a Mac that ever downloaded El Capitan in the past, you can use softwareupdate : Double-click the downloaded file to mount it on your desktop
The remains a vital piece of software for the vintage Mac community. It is the last version of OS X that feels lightweight on mechanical hard drives (HDDs) and supports legacy peripherals like FireWire audio interfaces.
Follow the on-screen instructions. This process will NOT install El Capitan yet. Instead, it will place an app named "Install OS X El Capitan" into your /Applications folder. Enhanced overall security patches
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Double-click the downloaded InstallMacOSX.dmg file to mount it on your desktop.