David Walsh, Official RepAll, We're working on adding support for MacOS 10.14 Mojave to a MindManager 11 for Mac update release. We plan to get the update out before the official release of Mojave.
AND APPLE STATES that:
Mojave Release date
It is likely that the final version macOS Mojave will be available for everyone to download in September or October 2018. However, if you want to get a feel for the new operating system now you can, if you sign up for the MacOS beta program. Either as a developer, or as a public beta tester. Find out how to get the macOS beta here.
So MIndjet still has several months to get it all done.