Mac OS Install Error - "Not 'identified developer'"

Last Updated: Nov 05, 2015 09:14AM PST
In Mac OS 10.8 (and higher) Apple began giving approved applications from their App Store preference on their OS. Installing older versions of Squeeze may give you an error saying something  "Squeeze cannot be installed because it is from an identified developer"

To solve this issue hold CTRL-click on the installer file (or right-click for those of us with a non-Apple mouse) and choose "Open."

If you would like to change this setting permanently follow these steps:
  1. In your System Preferences open the Security & Privacy settings.
  2. Then click on the padlock and enter your password.
  3. Then click on "Anywhere" under "Allow applications downloaded from:"
  4. Click on "Allow From Anywhere" when Apple pops up a scary dialog that says "Choosing 'Anywhere' makes your Mac less secure."
You can always change this back after installing your applications by changing the option back to "Mac App Store and identified developers"
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