The only safe method is to download the official installer directly from Apple. Apple hosts the installer as a hidden URL on their Support servers.
: If you already have El Capitan but need the latest bug fixes, download the 10.11.6 Combo Update How to Create a Bootable Installer mac os x 1011 el capitan iso download link
It is recommended to avoid using third-party sources and instead opt for official methods. The only safe method is to download the
For a virtual machine ISO, you may need a conversion tool like or specialized scripts to create a bootable .iso from the .app contents. For a virtual machine ISO, you may need
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Creating a "proper article" for this topic requires a nuance that is often missed in simple download lists. Because macOS El Capitan (10.11) is now considered "legacy" software by Apple, the download process is not as straightforward as visiting the App Store.