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„Install CrashPlanPRO” can't be opened…

Since OS X Lion version 10.7.5 the Mac is able to prevent applications from unidentified developers or sources from being launched. Since Mountain Lion 10.8, the Mac defaults to preventing applications from unidentified sources from being launched. You’ll get an alert dialog that says:
"Install CrashPlanPRO" can’t be opened because it is from an unidentified developer. Your security preferences allow installation of only apps from the Mac App Store and identified developers.

"Install CrashPlanPRO" can’t be opened because it is from an unidentified developer. Your security preferences allow installation of only apps from the Mac App Store and identified developers.

Gatekeeper

This new security feature is called GateKeeper. Gatekeeper is intended to prevent the installation of malicious software (malware) by only allowing programs with Apple-approved digital signatures to be run. You can access its settings within “Apple menu > System Preferences… > Security & Privacy > General tab” under the header “Allow applications downloaded from:”.

Gatekeeper will either allow you to run:

  1. Only applications downloaded from the Mac App Store
  2. Applications downloaded from the Mac App Store and from identified developers
  3. Any downloaded application.

Unsigned

The CrashPlanPRO installer that you downloaded from crashplan.probackup.nl is not digitally signed with an Apple-approved signature. Therefore it will only install without warnings when Gatekeeper is set to "Allow applications downloaded from: Anywhere".

Solution

Despite the Gatekeeper setting, you can still install CrashPlanPRO by following these steps:

  1. In Finder, press the Control key, and then click the "Install CrashPlanPRO" app icon
    or
    Right click the icon of the "Install CrashPlanPRO" app icon.

  2. Choose Open from the shortcut menu.Control clicking app icon then selecting _Open_ – Used to exempt Developer ID signature protection from a unidentified developer
  3. You'll still get a warning, but you'll also get the choice to Open the program anyway.
    Install CrashPlanPRO is from an unidentified developer. Are you sure you want to open it?
  4. If you're not logged in as an administrator, you'll be prompted to authenticate as one to allow this to happen.

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