Install Davisville folder in m-r-software/Omsi/maps/ folder
Install Ansagen in m-r-software/Omsi/Vehicles/MAN_SD202/Sound and click yes to merge folders
Install Davisville.hof to m-r-software/Omsi/Vehicles/MAN_SD202
Put Anzeigen folder in the m-r-software/Omsi/Vehicles/ folder and allow merging
Install Davisville.hof to m-r-software/Omsi/Vehicles/MAN_SD200
Have a great day!