Update 1.42 is available through official channels provided by SCS Software Steam Version
For those who want the technical details, here is a consolidated changelog for update 1.42 for Euro Truck Simulator 2 : Update 1
The integration of the FMOD sound engine allowed for more realistic engine sounds, environmental noise, and tire noise. Update 1
Euro Truck Simulator 2 Update 1.42 Download: The Definitive Guide to Extra Quality Features Update 1