This is really exasperating.... The Prepar3d support has answered me now. Well, until now the could not help me. They have deleted my account so I can create a new one. Didn't help. I have no idea what I should do. I don´t have a possibility to get a second Credit Card. I never knew that it is that hard to give people money . Guess I have to switch back to the good old FSX and have to take these crashes, errors and bad performance. Maybe someone is still here who haves some help for my problem. I would really, really, really appreciate it.
Thanks everyone for their comments.
With kind regards OnestayFS aka. Marius
Ps: Sorry for my bad English. It´s not my mother language.