Dorico Elements 3.5 wont launch

Worked yesterday. today when I double click the start icon nothing happens. after rebooting I get this;

An unknown interapplication communication error occured. In case the problem persists, please close all applications and restart your computer.

any ideas?

What version of the eLicenser Control software are you running? It should be at least 6.12. You can grab the latest from https://www.steinberg.net/en/company/technologies/elicenser.html