I'm currently running macOS 10.14 Mojave and I see this warning when I start the EV3 programming software:
Will it stop working if I upgrade to Catalina?
Is there an alternative?
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I just updated to Catalina Beta 10.15 and as expected, the software no longer starts.
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.
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.
In the meantime you could use the early release of the new version, made available for the home edition of the EV3.