Coral Painter 2019 does not open when launching it

Coral Painter 2019 does not open when I launch the application. I am using macOs Mojave (Version 10.14.6). Everything worked when I used the trial version. Then, I registered and used the license I bought and it was not responding any longer I deleted all customizations for all  workspaces but nothing happened. Then I uninstalled and installed the program again. Sadly, nothing changed.

I would be grateful  for some help!

Maren