How to install Mac OS X Yosemite
While installing Yosemite is not very different than installing Mavericks, you may have forgotten some steps from the last time. Let’s run through them now.
Before you begin
Excited though you are to install the latest version of Mac OS, there are things you should do before embarking on that installation. They include:
Be sure your Mac can run Yosemite: The good news is that if you’re currently using Mavericks, your Mac can also accommodate Yosemite—system requirements are the same for each. If you haven’t upgraded to Mavericks and aren’t sure whether it can run Yosemite, be sure that your Mac can be found within this list:
from Macworld http://ift.tt/1wN22lx