If you're using a Mac notebook computer, plug it into AC power.
It takes time to download and install OS X, so make sure that you have a reliable Internet connection. Time Machine makes it simple, and other backup methods are also available. Make a backupīefore installing any upgrade, it's a good idea to back up your Mac. If your Mac isn't compatible with OS X El Capitan, the installer will let you know. To find your Mac model, memory, storage space, and macOS version, choose About This Mac from the Apple menu . Mac Pro introduced in early 2008 or later Mac mini introduced in early 2009 or later MacBook Pro introduced in mid 2007 or later MacBook Air introduced in late 2008 or later MacBook introduced in 2009 or later, plus MacBook (13-inch, Aluminum, Late 2008) Apple has pages for High Sierra, Sierra and El Capitan than include links directly to the hidden Mac App Store pages with those downloads. If your Mac is too old to install macOS Mojave, you can still upgrade to the latest version of macOS that is compatible with it, even if you can't find those versions of macOS in the Mac App Store. Your Mac also needs at least 2GB of memory and 8.8GB of available storage space. You can upgrade to OS X El Capitan from OS X Snow Leopard or later on any of the following Mac models.