: Use a tool like WinRAR or 7-Zip . Right-click on part1.rar and select "Extract Here." The software will automatically pull data from the other parts to recreate the full file.
: Ensure you have every numbered part in the same directory. Euro.Truck.Simulator.2.v1.45.4.0s.part4.rar
How to install mods for Euro Truck Simulator 2 - Steam Community : Use a tool like WinRAR or 7-Zip
: You will usually see an .iso file, an .exe installer, or an .scs mod file. ⚠️ Important Considerations an .exe installer
If you are trying to install a large mod or a specific legacy build of the game: