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.
MacBook – How to install OS X Yosemite on an unsupported MacBook
macbook pro
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Best Answer
You should use following to make a bootable Yosemite USB.
Just replace the Untitled with name of the USB drive