Hi... I have a problem about to upgrade OS X... for some reason my Mac need "Mountain Lion" aplication, but this program can be run in OS X 10.6, and my Mac is stil OS X 10.5. How to upgrade it? Pls help me, I really need it... Thanks
Click here, check that your computer meets the requirements, buy the DVD, install it, and run Software Update.
Purchase the Snow Leopard install DVD from Apple
You can also go to the Mac App Store and Download it! It will download and install automatically.
The Mac App Store is only present in Mac OS X 10.6.6 and newer.
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