Hello tomaslolo - thank you for your comments!
Tested several installation methods, including your advise, nothing worked at the end.
Checked with debugview the keras script running. It is possible to start multiple zorro(s) for wfo in parallel, but all exit after the neural.training silently. The next step neural.save cannot open - r is not running anymore.
I do not have any idea what to do, so i will stop my activities in this issue at the moment.
Best regards!