ARCHIVED: How do I install or upgrade OS X 10.10 (Yosemite)?

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Upgrading from previous versions to OS X 10.10 (Yosemite)

OS X 10.10 (Yosemite) is no longer available for purchase from the Mac App Store. If you have a previous version of the operating system, and your computer meets the system requirements for OS X 10.11 (El Capitan), you can upgrade directly to that version instead; see ARCHIVED: Install or upgrade OS X 10.11 (El Capitan)

Reinstalling Yosemite on a computer already running it

Note:
To reinstall or recover Yosemite, you must have an active Internet connection. If you are on campus at IU, UITS recommends the wired Ethernet network instead of wireless. However, if IU Secure is your only option, see Connect to an IU wireless network in macOS if booted from your Recovery HD

Reinstalling while keeping files, applications, and settings

  1. Restart your computer, and immediately hold down command-r until the gray Apple logo appears.
  2. If prompted, select your main language and then click the arrow.
  3. Click Reinstall OS X, and then Continue. Follow the instructions on the screen, and then choose your hard disk. Click Install, and enter your Apple ID information if prompted.
  4. When the installation is complete, select App Store... from the Apple menu, and install any available updates.

Reinstalling while erasing everything on your computer

  1. Restart your computer, and immediately hold down command-r until the gray Apple logo appears.

  2. If you see a screen asking you to select your main language, choose it, and then click the arrow.
  3. Click Disk Utility, and then Continue.
  4. In Disk Utility:
    1. Click your hard disk in the left column, and then click the Erase tab.
    2. Next to "Format:", make sure Mac OS Extended (Journaled) is selected. In the "Name:" field, give your disk a name.
    3. If you would like to securely erase your data, click Security Options..., adjust the slider accordingly, and click OK.
    4. When you're ready, click Erase..., and then Erase again to erase your disk.
    5. Once it's completed, quit Disk Utility.
  5. Click Reinstall OS X, and then Continue:
    1. Follow the instructions on the screen, and then choose your hard disk.
    2. Click Install. If prompted, enter your Apple ID information.
    3. Once the installation is complete, you'll be asked to enter basic information, and have the option to transfer data from another computer or backup.
  6. From the Apple menu, select App Store, and then install any available updates.

This is document bfbv in the Knowledge Base.
Last modified on 2021-09-07 17:07:37.