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The latest version of Safari is: 9.1.2. Safari comes installed on all Apple computers, so you shouldn't need to download it. To make sure that it's up to date, use the Software Update feature by clicking the Apple logo in the very top left of the screen, choosing Software Update and following the instructions.
The latest version of Mac OS X is 10.6 (known as Snow Leopard). The latest update to Snow Leopard is 10.6.4 which can be downloaded, if it is not installed, by selecting Software Update from the Apple menu (in the top left corner). Software Update will show all the Apple updates that are available for the computer. Update: The newest version of OSX, as of Oct. 2015 is El Capitan.