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I have downloaded and made a bootable USB of Yosemite but once I boot holding the option key and attempt to install I get an error stating that Yosemite is already installed on my computer. I'm running Snow Leopard and I made my bootable USB using Diskmaker X.

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  • diskmaker is not the way to do it
    – Ruskes
    Oct 30 '14 at 4:57
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    Describe "unsupported MacBook". What MacBook model are you trying to install Yosemite on that would make it unsupported? Understand well that anything with a 32-bit EFI is simply not going to happen, period. Oct 30 '14 at 9:23
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You should use following to make a bootable Yosemite USB.

sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ Yosemite.app —nointeraction

Just replace the Untitled with name of the USB drive

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