However , as of 2023, Apple has broken the download links for El Capitan for most standard users. But there is a hidden terminal command that still works.

Before downloading, ensure your hardware is compatible. El Capitan supports most Macs from 2007 to 2015:

To ensure a safe and successful download:

The download for Mac OS X El Capitan 10.11.1 is not found on a fast BitTorrent seed; it is found via two reliable methods:

Many creative professionals rely on specific software versions that may no longer be supported in newer macOS releases. For example, certain versions of Final Cut Pro, Logic Pro, or specialized third-party plugins run best—or only—on OS X El Capitan. A clean install via an ISO is often the best way to create a dedicated environment for these workflows.

Improvements to VoiceOver reliability and fixes for third-party Audio Unit plugins. Official Ways to Download OS X El Capitan

Any website promising a direct "one-click ISO download" for El Capitan 10.11.1 without a checksum is likely serving adware or ransomware.

Why use an ISO? Because you want to run legacy software without buying a 2015 MacBook Pro.