Feedback Detective Office

Hi,

(I'm not sure if this post belongs here, but as the readme states, posts will be bumped to the right part of the forum, thank in advance ;-) )

Yesterday I bought myself the Detective Office asset;
https://assetstore.unity.com/packages/3d/environments/urban/detective-office-178250#reviews

I started up different Unity versions, 2019/2020/2021 LTS, enabled HDRP and imported the asset.
Unfortunately the scenes are greyish and there is no installation/configuration guide included.

Does anyone have the asset up and running and looking like the provided demo?
Or does anyone have an advice on how to set this asset up?

thanks in advance,
Joost