You posted in the "Snow Leopard Forum", so I assume that is your correct version of OS X? If so, OS X 10.6.8 is the last version that Apple put out, so there are no further "Updates" for it. If you mean you want an "Upgrade" to 10. 7 "Lion", or 10.8 "Mountain Lion", you have to purchase those from the Mac App Store. They are not Free.