If you have determined that your Mac can run Yosemite, then (as always) your first move before upgrading should be to perform a system backup to protect your data. You can buy Snow Leopard for $19.99 here. If you have an ancient Mac with an OS predating Snow Leopard, you will need to install Snow Leopard before then moving to Yosemite. You need be running one of the following: The About This Mac window will show which version of OS X you have. Its 10.6.6 update introduced the Mac App Store, which you'll need in order to download Yosemite. If you haven't updated your Mac's operating system in a number of years, then you need to check to see if you are running at least OS X 10.6.8 Snow Leopard, which was released way back in 2009. Or watch this video about how to upgrade the RAM on a MacBook Pro. You may wish to read our article on upgrading your Mac's memory.
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