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How To Downgrade from Mac OS X 10.6.7 to 10.6.6

Snow Leopard Install Screen

  1. While OS X is running, insert your OS X Snow Leopard Install DVD.
  2. Double click Install Mac OS X.
  3. Keep the DVD inside your computer while you wait for it to restart.
  4. Wait until the second phase of the installation procedure completes.
  5. You are now downgraded to OS X 10.6.2 (or something less than 10.6.6).
  6. Download and apply the OS X 10.6.6. combo update to bring you back to 10.6.6.