If you have an older Mac and you would like to load Mac OS X 10.11 El Capitan on it, it can be a challenge to find and download it from the Mac App Store.In. Question: Q: Download link to 'Install OS X El Capitan.app'? I upgraded my old iMac, early 2010, to OS X 10.11.6 recently and it's doing good. But I want to make a recovery bootable USB flash drive.
I know that in the past if I've previously downloaded OS X El Capitan from the App Store I could download it again from the Purchased tab in the App Store, however now that macOS Sierra is out I'm not able to download it as it says INSTALLED (and grayed out) even on a system running OS X Mountain Lion 10.8.5. Pressing any key combination, e.g control, option, etc. doesn't change the button to DOWNLOAD. All other previous versions of OS X can still be downloaded from my Purchased tab in App Store as they still say DOWNLOAD and are not grayed out, thus active.
Download El Capitan App Store
The image below is from a system running OS X Mountain Lion 10.8.5, does not have OS X El Capitan installed on it or even the Install OS X El Capitan.app on its filesystem, yet it says it's installed and grayed out.