Can not load or edit Halion Sonic SE in Cubase 11

I can see it in the Media Rack, but it refuses to load in place. After added it to a track as a Instrumet, its not showing in the VSTi Rack; there it just says “No VST Instrument” for the track

Have checked the usual suspects:

  • download and install from Download Assistent - checked
  • Cubase in safe mode - checked
  • plug-in manager - checked

… but no, still not working. All other Instruments and plug-ins works like a charm. Any clues? Plz.