Truck Simulator 2 Version 1.30 Highly Compressed Download Portable: Euro

"Highly compressed" versions are typically third-party repacks intended to reduce download size. ETS2: Update 1.30 - The Truck Simulator Wiki

Legitimate "repacks" (compressed versions created by scene groups) exist. They usually compress the game to roughly 60-70% of the original size (e.g., 4 GB down to 2.5 GB). Downloads claiming to be under 1 GB are highly suspicious.