I just purchase the lisence and wanted to activate it but there is always an error occurring and i can't find anything on the internet because it's a german error message.
I've attached an image, perhaps someone can help me.
Check this post:
To see if it can help you solve your problem.
PTC does have a department or unit referred to as "Customer support".
Maybe this link works for you:
If not, I can only refer to this: