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Message: <blockquote data-quote="Raz0rEdge" data-source="post: 1635620" data-attributes="member: 110816">Welcome to Mac-Forums..Ensure that you are running the latest update to Snow Leopard which is 10.6.8. You know you are running this update if you have the Mac App Store in your Dock.If so, go to the Mac App Store and login as yourself and you should see Yosemite prominently displayed for you to download free of charge.Once the installer is downloaded, it will try to run to upgrade your machine, you want to break out of it and copy the installer to a USB flash drive <a href="http://www.macworld.com/article/2367748/how-to-make-a-bootable-os-x-10-10-yosemite-install-drive.html" target="_blank">using these instructions</a>.Now, use the USB flash drive to get into the Yosemite installer, erase the hard drive completely and do a fresh install..</blockquote>