iMac (Mid 2007 or newer), MacBook (Late 2008 Aluminum, or Early 2009 or newer), MacBook Pro (Mid/Late 2007 or newer), MacBook Air (Late 2008 or newer), Mac mini (Early 2009 or newer) or
Mac Pro (Early 2008 or newer) – you can OS X Yosemite download and instal for free now via Mac App Store and Torrent.
A lot of Mac owners have one question – upgrade or clean install. We recommended: clean installation Mac via bootable USB.