If you are using the truck as a static asset in map editors, ensure you have the Iveco TurboStar Asset Pack which includes 30 different truck and trailer configurations.
Copy the files into your ETS2 mod folder, typically located at: Documents\Euro Truck Simulator 2\mod IVECO TURBO STAR 1.46
Obtain the mod files (usually in .scs or .zip format) from trusted community sources like the SCS Software Forum . If you are using the truck as a