Trying to reinstall Yosemite on a friends Mac, figured it'd be easy stuff. Got a download for 10.10.2 Yosemite, then used my Windows 10 with CMD, and made the drive bootable for Mac with Diskpart. An empty USB drive (6 GB or larger): In this guide, you will write Yosemite Zone onto a USB drive, and boot your computer from that drive to install OS X Yosemite. The USB drive must be at least 6 GB in size.
RECOMMENDED: It’s been close to two weeks since the final version of Mac OS X Yosemite operating system is available for the public. Yosemite, first beta released back in June, is the newest version of Mac operating system with plenty of new features. OS X Yosemite is not only brings new interface to the Mac OS but also hundreds of new features and improvements. Yosemite or OS X 10.10, just like Mavericks, is available as a free update, meaning Mac users running Snow Leopard (10.6.8) or later version of Mac OS X can upgrade to OS X Yosemite for absolutely free.
The only thing you need to check before thinking of upgrading to Yosemite is if your Mac is compatible with OS X Yosemite. Mac Book Air released late 2008 or newer, iMac mid 2007 or newer, MacBook released late 2008 or newer, MacBook Pro mid/late 2007 or newer, Mac mini early 2009 or newer, and Mac Pro released early 2008 or newer are compatible with Yosemite. OS X Yosemite download If your Mac supports OS X Yosemite, you can follow the given below instructions to download OS X Yosemite on your Mac and then either upgrade your existing version of OS X to Yosemite or perform a clean install by creating a bootable USB of Yosemite. Step 1: Visit of Yosemite on your Mac, scroll down and then click Upgrade Now button to open OS X Yosemite in App Store. Step 2: Click the small Free button located upper left of the page and then enter your Apple Store ID and password if and when asked to begin downloading OS X Yosemite installation files on to your Mac. The installer size is about 5.2 GB and might take a couple of minutes to hours depending on your internet connection speed. Once downloading completes, an app labelled Install OS X should appear on in your Applications folder and launchpad.
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You can either upgrade your existing installation to OS X Yosemite by clicking the app or create a bootable USB to perform a fresh installation of OS X Yosemite. And before upgrading or performing a clean installation, we recommend you backup all important data. Also, the partition must have at least 8 GB of available space in order to upgrade to OS X Yosemite. Should you don’t have a good internet connection, please visit the nearest Apple Retail Store.