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TechNote #142: Last modified: 02/27/2014

MathType installer won't open on Macintosh OS X

The information in this document applies to:  

  • MathType 6.7d and earlier (Macintosh)
  • MathType 6.7e, if the installer file ends in .dmg
  • Mac OS X 10.7 (Lion)
  • Mac OS X 10.8 (Mountain Lion)
  • Mac OS X 10.9 (Mavericks)


When attempting to install MathType on Mountain Lion, an alert dialog opens saying '"MathType 6.7d Installer.mpkg" can't be opened because it is from an unidentified developer". If you're trying to install MathType 6.7e, there are 2 installers to choose from. If you choose the wrong one for your operating system, you'll get a similar error to the one shown here.



With Macintosh OS X 10.7, Apple introduced a new security measure called Gatekeeper, designed to provide greater control as to what can or cannot be installed onto your Macintosh. Depending on how this is set, it may stop the MathType installer from running.



You should download and install MathType 6.7e, making sure to download the one that's labeled for OS X 10.7-10.9. This is a free upgrade for MathType 6.7 customers. Alternatively you can run the MathType 6.7d installation without changing any security settings as follows:

  • After expanding the .dmg file, CTRL+Click (Or right-click) the MathType 6.7d Installer.mpkg to expose the contextual menu and click 'Open.'


  • This will produce a new dialog asking you to confirm your intention of opening the installer

  • Click Open.
  • Once this last confirmation is done, the MathType installer will run. Follow the onscreen instructions to complete the installation. If the problem persists, contact Design Science Technical Support at


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