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Nov 25, 2015 10:14 AM in response to TSGDazzaby Loner T,1. Please see OS X versions and builds included with Mac computers - Apple Support .
2. You may be able to install Yosemite on an external disk - How to install OS X on an external drive connected to your Mac - Apple Support or find an older Mac, install Yosemite and try to boot from this disk. It may cause CPU Panics, if your CPU model is not supported.