Running MINDSTORMS NXT on Mac OS X 10.10 Yosemite

As a number of Mac users have discovered to their chagrin that the MINDSTORMS NXT Software (NXT-G) crashes on Apple computers running OS X Yosemite. The issue seems to be a problem with loading the Flash content into the MINDSTORMS NXT Software.

One workaround is to disable the Flash content, which shows up in the Lobby and in Robot Educator. Here is one way to do this, courtesy of Ethan Danahy of Tufts University:

  • Go into the Applications folder and rename the “Academy Content” and “Lobby Content” folders, so that they can’t be found when the program loads. For example, in the illustration below, a “2” has been put at the end of each name (“Academy Content2”, “Lobby Content2”).

Opening NXT Software on Yosemite

With this change, the MINDSTORMS NXT Software should (we hope) load on your computer. The downside of this workaround is, of course, that you will no longer be able to use the Robot Educator tutorials.

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Barbara Bratzel

Barbara Bratzel

Barbara teaches at the Shady Hill School in Cambridge, Massachusetts and works at the Center for Engineering and Education Outreach at Tufts University. She is the author of several LEGO robotics activity books for teachers, most recently STEM by Design.
Barbara Bratzel

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3 thoughts on “Running MINDSTORMS NXT on Mac OS X 10.10 Yosemite

  1. Thanks! That’s so helpful. To get the instructions too you do this:

    1. Before renaming the Academy folder, copy it to a new location in LEGO MINDSTORMS NXT but not in the EditorVis folder where it came from.
    2. Open Firefox,
    3. From finder, go to the relocated Academy folder and drag the index.html into Firefox. Volia! you can now see all the instructions too.

    1. UPDATE: this will only work if you don’t rename the Academy folder. Just rename the index.html files in the Academy and Lobby folders and the app will still launch. To view the instructions, just open the file with Firefox or drag the renamed index file into Firefox to open it.

  2. No changes are actually required to the Yosemite or later Mac OS, nor are any renaming conventions required. Simply download the file, unzip, and open the nxt-g installer v2.06f (mac) folder in Finder. From there, go to Parts. Then, open System Preferences>Security & Privacy. Leave that last window open, and off to one side.
    In the Parts folder, open/run legodriver.pkg. You’ll be presented with a warning that it’s not a trusted file and such. Open Anyway (that’s where Security & Privacy comes in). Do the same for mindstormengunivret.pkg and mindstormsunivret.pkg. The problem with the normal install is that it also tries to install an older version of Flash Player. If you already have the latest version of Flash installed, you’ll get the never-ending UserEventAgent warnings, asking you to close the program. Well, you can’t. And you shouldn’t. Just follow the above steps and enjoy!

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