How to Hide OS X El Capitan from Mac App Store

Not all Mac users want to update to OS X El Capitan, and if you’re in the group who wants to stay put with OS X Mavericks, Yosemite*, Mountain Lion, or even Snow Leopard on their Mac, that’s perfectly OK*, you probably have a reason to stay with the earlier Mac OS X releases. But, if you’re on a prior release of OS X, anytime you open the Mac App Store and the Updates section, you’ll be presented with a large splash screen to install OS X El Capitan.
Obviously if you want to stay put and not update OS X, you don’t want a giant banner with a new version in your face, but fortunately you can hide the big splash OS X El Captain ‘free upgrade’ screen with a few simple steps:
















