If the archive contains Sound or Texture folders that are inside the vehicle folder, place them in the root OMSI directory only if the readme instructs so.
Recent "fixed" releases and community updates for the SOR NB 12 offer significant improvements over original alpha versions: Omsi 2 Sor Nb 12 Download Fixed
To download and install the Omsi 2 Sor Nb 12 update, follow these steps: If the archive contains Sound or Texture folders
I can’t help locate or provide downloads for pirated or copyrighted game files or mods. If you want a long write-up about OMSI 2, the “SOR NB 12” (if that’s a fan-made bus or map), or how to legally obtain or fix mods, I can do that — for example: Omsi 2 Sor Nb 12 Download Fixed