License manager failed to initialize - error 200 - Rhino 7.15 Trial

Hi there,
I downloaded Rhino in December, installed it with the trial code and it has worked wtihout errors. In February i want to start it again but it failed to open with an error message from the license manager.
“failed to initialize license manager … error 200”
things i tried:
Repairing the installation (as mentioned in some threads).
complete deinstall, redownload and new install (with multiple pc restarts).
still the same error.
there is neither Revit nor VRAY installed
any ideas?

Thank you in advance

Hi Sebastian -

Make sure that there are no pending updates for your Windows installation.
Apart from that, here are two more suggestions: