Instead, you fire off the installation app directly on your Mac under the older version of OS X.
Boot From the OS X Mavericks Installer
1.
Plug the USB flash drive that contains the Mavericks installer into one of the USB ports on your Mac.
Screen shot courtesy of Coyote Moon, Inc.
I don’t recommend using an external USB hub for the installation.
Use one of the USB ports on your Mac.
- power cycle your Mac while holding down the option key
3.
Screen shot courtesy of Coyote Moon, Inc.
The OS X startup manager will appear.
Press the Enter key to start your Mac from the OS X Mavericks installer on the flash drive.
After a short time, you’ll see the installer’s Welcome screen asking you to select a language.
Screen shot courtesy of Coyote Moon, Inc.
Make your selection and hit the right-facing arrow button to continue.
Use Disk Utility to Erase the Startup Drive
1.
From the menu bar select Utilities, Disk Utility.
3.Disk Utilitywill launch and display the drives available to your Mac.
In the Disk Utility sidebar, select your Mac’s startup drive, which is usually named Macintosh HD.
You are about to erase your Mac’s startup drive.
check that you have a current backup before proceeding.
hit the Erase tab.
ensure the Format drop-down menu is set to Mac OS Extended (Journaled).
poke the Erase button.
You will be asked to confirm that you really, really want to erase your startup drive.
(You do have a current backup, right?)
tap the Erase button to proceed.
Your startup drive will be wiped clean, enabling you to perform a clean install of OS X Mavericks.
You’ll be returned to the Mavericks installer.
Start the Mavericks Install Process
1.
In the Install OS X Mavericks screen, opt for Continue button.
The Mavericks licensing terms will display.
Read through the terms, and then click Agree.
The installer will display a list of drives attached to your Mac that you could install Mavericks on.
snag the startup drive you erased in the previous step, and then click Install.
The Mavericks installer will start the installation process, copying the new OS to your startup drive.
So relax, grab a coffee, or go for a walk.
The Mavericks installer will continue to work at its own pace.
When it’s ready, it will automatically kickstart your Mac.
Once your Mac restarts, proceed to the next page to complete the OS X Mavericks initial configuration process.
