Apple also releases system updates that keep your Mac secure and stable.
When a new major version of OS X is released, you can download the upgrade for free from the App Store.
You should now click on the Show Details button to see what updates are going to be installed on your computer.
If you see this message, you can click on the Quit button to exit the software update procedure.On the other hand, if updates are available you will be shown a dialog box, similar to the one below, asking what you would like to do.If you aren't already on OS X 10.9 Mavericks you can upgrade for free by visiting this link.Mavericks is compatible with:● i Mac (Mid 2007 or newer)● Mac Book (Late 2008 Aluminum, or Early 2009 or newer)● Mac Book Pro (Mid 2007 or newer)● Mac Book Air (Late 2008 or newer)● Mac Mini (Early 2009 or newer)● Mac Pro (Early 2008 or newer)● Xserve (Early 2009)You can check your version of OS X by select About from the Apple menu at the top left of your screen.Click the Update button, or if you want to install all the updates available for your computer, click the Update All button.
Step Three A popup will appear warning you that you will need to restart after the download is complete.These updates not only fix problems with applications and the operating system, but also fix security vulnerabilities that can be used by computer viruses to infect your computer.Unfortunately, many people feel that because they are using a Mac they are much more secure and thus may not be as diligent in updating their software as they would on a Windows machine where viruses are much more common.If an update to OS X is available it will read something like OS X Update 10.9.2.Usually a restart required message will accompany the item.Make sure you've saved all your work in any open applications and click the Download & Restart button.