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If your Mac isn't new enough to run Yosemite, then unfortunately it's not capable of running an Apple operating system that's still fully supported.
Remember, even Lion isn't supported anymore, and Snow Leopard hasn't gotten new security updates for quite a while, so it's best to avoid using both of these older operating systems.
That's not terrible given that it's been out for less than a month.
Mavericks, which has been out for a year and is still being supported, has close to 52% of the Mac market share; that's pretty respectable, and roughly comparable to Windows 7's percentage of the overall PC market, but nowhere close to i OS adoption rates. All other versions of OS X, though, including Lion (nearly 8%) and Snow Leopard (over 10%) on down, comprise roughly 20 to 23 percent* of the Mac market, or over 1/5th of all Macs still being used online.
Yosemite, like its predecessors Mavericks and Mountain Lion, requires one of the following Macs with at least 2 GB of RAM and 8 GB of available hard drive space: You can do a direct upgrade from Snow Leopard v10.6.8, Lion, Mountain Lion, or Mavericks.
If you still have an earlier version of OS X on your compatible Mac, you will need to download Yosemite on another compatible Mac with 10.6.8 or later, create a bootable Yosemite flash drive or external hard drive (using Apple's official instructions or the third-party tool Disk Maker X), and do a clean install overwriting the hard drive on your Mac—so be sure to carefully back up all of your files first.
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Still older Macs can't even be upgraded to Lion, meaning they'll be stuck with Snow Leopard (version 10.6.8) or some earlier version of OS X.