To download and create a bootable installer for OS X El Capitan (10.11) or macOS High Sierra (10.13), you should use official Apple channels to ensure the files are safe and complete. 1. Official Download Links

Downloading and choosing between OS X El Capitan (10.11) and macOS High Sierra (10.13) depends largely on your hardware's age and storage type (HDD vs. SSD). While both are legacy systems, High Sierra is generally the better choice for security and modern app compatibility if your Mac supports it.  Download Options & File Formats 

If you specifically need an ISO for a virtual machine, you must manually convert the .app installer: OS X El Capitan dmg download that works for now?

In the timeline of macOS, El Capitan (10.11) holds a special place. Released in 2015, it followed the visual overhaul of OS X Yosemite and focused almost entirely on performance, stability, and security. For users looking to download the .bin or .ISO image today, usually for a Virtual Machine (VM) installation or to revive an old MacBook, El Capitan remains one of the most reliable options available.

macOS 10.13 High Sierra: This is usually accessed through a link that redirects you to the Mac App Store. 2. ISO/BIN Downloads (Best for Virtual Machines)

Mac App Store: If your Mac is compatible, you can find El Capitan in the App Store under the "Purchased" tab if you have downloaded it before.