Dorico 4 install & activation went fine...Almost

We’ve seen a few reports of this e.g. Unknown interapplication HSSE occurs (Solved!) - #14 by Buer. It is most likely caused by an old plugin/component that is triggering a crash - perhaps the EUCON dll or Groove Agent. If you can work out which one, as in that other thread, you should be able to get things working.