OS X

Installing OS X

How to Create Bootable Installer

You need to download the installer for the specific version of OS X (e.g. "Yosemite installer.app") from online because apple does not support a direct method to download the app. With a usb drive plugged into the mac you installed the installer on enter into terminal and enter the following command " sudo /Applications/Install\ macOS\ Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/ (name of drive)" Wait for command to complete.

How to Install with Installer

and then plug usb into mac you want new OS X on. Turn off the mac and turn it back on and hold the options key while it boots until you boot into the boot order menu. Choose the usb and OS X will install.