Configuration options for updating os
Automatic software update checking is enabled by default as soon as you start using your Mac.
NOTE In OS X El Capitan, both administrative and standard users are allowed to install system software updates via the Mac App Store.
Both automatic and manual software updates require an Internet connection to download update installers.
In this case, when updates are ready to be installed, a Mac App Store notification displays, stating “Updates Available.” From this notification you can click Install or Restart, which will immediately install the updates and restart the computer if necessary.