HT1338 Trying ti install my tomtom gps into computer for updates, computer says it cant be opened, unidentified developer. What do I do?

I am trying to get my gps navigator updated through my computer, cant be opened unidentified developer.What do I do?

Welcome to the Apple Support Communities
The latest OS X Lion version and OS X Mountain Lion include Gatekeeper, a feature that is set up to prevent the installation and opening of apps that don't come from the Mac App Store or are from identified developers (apps without Developer ID). See > http://support.apple.com/kb/ht5290
To install the TomTom application, you have two options:
1. Right-click the installer, and choose "Open". Do the same after installing the application, when you are going to open the application for the first time.
2. Open System Preferences > Security & Privacy > General, and choose "Anywhere" under "Allow applications downloaded from". This will work for all the applications

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