Try this fix - https://nvidia.custhelp.com/app/answers/detail/a_id/5182/~/unable-to-launch-vulk...
:(((
Sorry @just_manu - not sure why you would be getting a 401 / unauthoised error. I'm thinking I might upload the game to github in the coming days - will share here and you can tinker around that way.
Ok ok, by the way, you seem to be a nice person, it's nice to find some polite people on the internet, there are few these days.