HT1222: Apple security updatesLearn about Apple security updates
Currently Being ModeratedOct 17, 2012 1:31 AM (in response to Musa Musavi)
The combo update installs missing sytsem files if you have problems with your Mac mainly used for troubleshooting.
For updating your system software, click your Apple menu icon top left in your screen.
From the drop down menu click Software Update ..
That will prompt the App Store for you for updating.
The combos are not available from the Mac App Store.