represents a high-water mark for Apple’s transition from skeuomorphic design to flat, modern macOS. While Apple would prefer you upgrade to a supported OS, the reality is that millions of Mac Pro 5,1, MacBook Pro 2011, and iMac 2010 users rely on this exact version.
This article provides everything you need: what this specific version is, where to find a legitimate ISO image, how to create your own bootable ISO from Apple’s official installer, and how to use it for virtualization or USB creation. mac-os-x-el-capitan-10-11-1-image-iso
Once you've downloaded the ISO image, follow these steps to install Mac OS X El Capitan 10.11.1: represents a high-water mark for Apple’s transition from
: Up to 1.4x faster app launching and 4x faster PDF viewing in Preview compared to previous versions. MacBook Pro 2011