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Go to the Applications folder and open “App Store”.

If you wish to upgrade FROM Snow Leopard, make sure you are running OS 10.6.8. Afterwards you can start up from your old OS or Snow Leopard by pressing OPTION key during startup. Alternatively, install Snow Leopard to a empty partition that has been formatted as Mac OS Extended (Journaled) with the GUID option. however, I recommend making a complete bootable backup before doing so in case something goes wrong during installation, such as power outage. Many people simply upgrade directly over the old OS installation.

After installing, do Software Update (under the Apple Menu) to bring Snow Leopard up to OS 10.6.8. If your Mac does not have an optical drive, the DVD has instructions on doing a remote install from another Mac on the same network. Then purchase the Snow Leopard install DVD from the Apple Store. (If the word “Intel” appears anywhere beside “Processor” you have an Intel-based Mac.) To find out go to Apple Menu and select “About This Mac”. If you wish to upgrade TO Snow Leopard (OS 10.6), make sure you have an Intel-based Mac (Snow Leopard will not run on a PowerPC processor) with at least 1GB of memory and has Mac OS 10.5 or earlier.