minimwatch2 on Mac

[linntonik]

I used minimserver 0.8 on my old QNAP together with minimwatch 0.8 on my Mac for years and it worked fine with the LINN Kazoo app.
Due to a new QNAP (TS-230) I had to install minimserver2 and activated the free trial version.
I also downloaded Minimwatch 2 and installed it as written in the installation guide.
Unfortunately now I suddenly have no Minimwatch icon in my menu bar, so I can't make any settings. Of course I tried several times to start the program.
What could have gone wrong here?