While Steam auto-updates, you can revert to 1.42 for the "Extra Quality" experience:
The keyword phrase "Extra Quality" is often used by the community to describe the high-fidelity assets introduced during this era. With Update 1.42, SCS Software deployed an updated lighting system that served as a precursor to the full HDR implementation seen in later versions. This changed the way light interacted with the environment, vehicles, and surfaces. Euro Truck Simulator 2 Update 1.42 Download Extra Quality