Try the free offline version as a demo. If you enjoy the chilled, overhead tram-like feel, buy the full add-on for the complete route and features.
However, the OMSI 2 community provides a called "Wuppertal Ost" available on community forums like the OMSI-WebDisk. 🚠 The Official Wuppertal DLC
You get the full, stable experience with all the bus lines (like the articulated buses) and the unique hanging railway functioning perfectly. 3. Budget-Friendly Alternatives