Ensure you have the original Projekt Szczecin or the necessary Polish object packs installed. Fikcyjny Szczecin relies on many base assets from the original project.
Once you find a trusted source:
The map is generally available in two formats on Polish community forums and the OMSI Forum : omsi 2 fikcyjny szczecin 25003 download upd patched
Since the original download link on sites like Strefa-OMSI was approximately 1.38 GB , various "patched" and "updated" versions began appearing on third-party blogs to fix missing textures and broken AI paths. Ensure you have the original Projekt Szczecin or