1. Download & install K++ mod for Solaris Urbino IV-generation:
    https://pz.hkt172.net/omsi/kruegermatrix/solaris_urbino_iv/ 
  2. Install this to replace the original buses so that it works with BCS (overwrite asked files)
    https://nx9934.your-storageshare.de/s/RJDk4pNMeEDBkXC