Thank you very much for the hints and sorry, that I reply that late. I forgot to bookmark this thread.It worked with installing the app onto a different (Debian Linux) machine. There I was able to setup the stick and it works.
The Kodi FLIRC addon did not work on the latest Beta of LE, these is just a bright blue screen and sometimes it is possible to see some buttons when hovering with the mouse over these buttons. But only sometimes. Also it flips from connected to disconnected all the time. Strange.
The addon is not a necessity but i downloaded the source and will look up what i can do to make it work.
Will report here if i find something.