Version 1.39 brought a significant rework to France. SCS Software rebuilt the city of Liéal (based on the real-world city of Lyon). This wasn't just a visual polish; they completely redesigned the road network, adding new intersections, landmarks, and a more realistic layout for truck drivers navigating the French countryside.
The game updates automatically for Steam users. If you are on an older version, you can right-click the game in your library, go to Properties > Betas , and select "public_beta - 1.39" if you need that specific version.