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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