I'm currently running macOS 10.14 Mojave and I see this warning when I start the EV3 programming software:

LEGO MINDSTORMS EV3 Home Edition.app is not optimized for your Mac and needs to be updated.

Will it stop working if I upgrade to Catalina?

Is there an alternative?

  • Just to clarify, the reason it won't work is because most of the software in the package is 32-bit only, and macOS is dropping 32-bit code support. They will need to recompile the software for 64-bit. – Alexander O'Mara Jun 29 at 17:51
  • I have downloaded the early release version, and am really struggling to get much of it to work. Not very impressed with Lego, a huge company, who should have been better prepared than this. – Spence Nov 6 at 11:02

I just updated to Catalina Beta 10.15 and as expected, the software no longer starts.

LEGO MINDSTORMS EV3 Home Edition.app needs to be updated

The same happens with both the Home and the Education version.

The LEGO Education website says:

Attention Mac Users: This Software will not work with future versions of MacOS. We are aware of this and we are looking into a solution.

Source: https://education.lego.com/en-us/support/mindstorms-ev3/software-launch-issues


LEGO has made an announcement about a replacement software.

The current version of the EV3 Lab software is not compatible with the upcoming release of Apple’s operating system for Mac computers, called ‘Catalina’. We have therefore decided to replace the current EV3 Lab software and EV3 Programming App with a completely new app, called LEGO® MINDSTORMS® Education EV3 Classroom. Featuring a coding language based on Scratch, EV3 Classroom will initially launch for macOS in November 2019 and in spring 2020 for iOS, Windows 10, Android and Chrome. EV3 Classroom will offer a consistent experience, features, and content across all devices. The first release of EV3 Classroom will be in US English, followed by the other 15 EV3 languages in spring 2020.

To continue to enjoy an uninterrupted EV3 experience, we recommend that you upgrade to the new EV3 Classroom app before updating to the new OS version. For further questions and support, you can to reach out to Technical Consumer Service at https://education.LEGO.com/en-us/support.

  • Waiting 6 months to upgrade to Catalina may be a good idea in general, but this adds to the reasons. Let's see how they do on bug fixing. – chicks Oct 11 at 22:23
  • 1
    Since the information here will keep changing for a while, I've changed this to a community wiki answer, so please feel free to update as more information is made available from LEGO. – David Lechner Oct 12 at 18:38

In the meantime you could use the early release of the new version, made available for the home edition of the EV3.

  • Thanks, is there any info about how the features in this version match up against the existing software? – Ken Williams Nov 3 at 21:17

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