Some versions of old macOS installers are archived there for vintage system restoration – but check licensing rules before downloading.
: Unmount the image and use Terminal to convert the file format from 3. Alternative Resources mac os x el capitan 10.11 6 iso download 720p
For those already on 10.11, the 10.11.6 Combo Update is available to bring your system to the final, most stable version. Clarifying "720p" Some versions of old macOS installers are archived