To get Euro Truck Simulator 2 (ETS2) version 1.40 working, the most reliable method is to use the official Steam Beta system to "downgrade" your current version. Version 1.40 was a major update released on March 24, 2021, which introduced a complete overhaul of the lighting system.  How to Download Version 1.40 on Steam 

Scenario A: You own the game on Steam (Official Method) If you own ETS2 on Steam, you no longer download version 1.40 directly by default, as the platform automatically updates the game to the latest version. To revert to 1.40:

FAQ: Download Euro Truck Simulator 2 Version 1.40

Q: Can I download 1.40 directly from the SCS website?
A: No. SCS does not provide direct download links for past versions. You must use Steam Betas or GOG rollbacks.

Germany Reskin: The final phase of the "Revisiting Germany" project, which rebuilt major road networks and intersections around cities like Dortmund, Köln, Dusseldorf, and Duisburg.

Download locations: The SCS Forums and ModLand (ensure you scan links with VirusTotal).

: Added a full-text search for cities and companies in the job selection screen and improved the vehicle adjustment menu. How to Download and Install