IVI compliance package, Max does not show any installed driver

Hi there,

I recently updated my compliance package to 15, now NI MAX does not show any LocialName, DriverSessions and so on. I'm even not allowed to create a new session. This feature is disabled (see attaced picture)

I tried to downgrade back to compliance package 14. Since this failed, I even reinstalled all NI software along with the IVI shared components.

Deserializing the ConfigStore in C# will also fail. It says the Configstore is not registred. So am I missing  something here? Do I have to install another package to get back the configstore?

kind regards