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Install Mac OSX Yosemite

Download Yosemite from the App Store

  1. Open the App Store from an existing Mac OSX installation;
  2. Download Mac OSX Yosemite;
  3. Once downloaded, Mac OSX Yosemite installer will run automatically; dismiss the installer window and proceed.

Burn Yosemite on a USB disk

  1. Insert a blank USB disk (>= 8GB) to your machine;

  2. Find the volume name in terminal;

    ls -la /Volumes/

  3. Run the following command, replacing /Volumes/Untitled with the actual name of your volume.

    sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ Yosemite.app --nointeraction

Install Yosemite

  1. Plug the USB key to your machine;
  2. Go to System Settings > Startup Disk;
  3. Select the USB disk, i.e. something along the lines of Install OS X Yosemite 10.10.1, and hit Restart;
  4. Follow the instructions on screen (be patient, this will take a couple of hours).