NOTE/UPDATE:An ARES Commander 2018 update (Build 18.2.1.3136) for the MacOS X Mojave that addresses this issue is already available under:

https://www.graebert.com/component/productselect/downloads#mac

To Run Older ARES Commander Versions before Build 18.2.1.3136: Previous versions of ARES Commander don't work under OS X Mojave after installation. ARES Commander customers shouldn't upgrade their existing operating system directly to Mojave (which is for free for El Capitan or higher), because there is a crash at the first start of the application and a Fixed-UI-Mode issue with a flickering graphical area. Reverting from Mojave to the previous Mac OS X operating system version is also difficult.

Workaround for Older ARES Commander Versions:If a customer had already installed Mojave then we have a workaround. Before the first start of the CAD application customer has to add it to the Privacy exceptions dialog (Allowed Apps) under Security&Privacy settings.Then the application starts without any issues. Further, its recommended using the Mac-UI-mode (command UIMODE).

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