Why the status of RealUser XModule is not Installed at setting after installing XModules

Hi
I run uiVision on an ubuntu 22.04 vm in firefox(122.0 (64-bit)) and it shows the licence (Player Edition active) in the pro tab.

Even so I installed xFiles successfully it shows as not installed.
When clicking Test it does not find them and when running a xfiles demo I get this error:
01: RealUser Simulation XModule is not installed yet

Could you please help me to fix this?

Best wishes

Anselm