You can right-click ETS2 in Steam → Properties → DLC → Uncheck all map DLCs. This reduces the install size back to ~5 GB.
The official and safest way to download Euro Truck Simulator 2 (ETS2) for PC is through the official game website or established digital storefronts like Download Euro Truck Simulator 2 Highly Compressed For Pc
Feel the weight of the cargo, the air pressure in the brakes, and the challenge of navigating tight European streets. System Requirements You can right-click ETS2 in Steam → Properties