This specific keyword——is highly technical and typically associated with the "modding" or unofficial distribution community. The string 0xdeadc0de is a famous hexadecimal constant often used by certain groups to signify custom-built installers or cracks for game updates.
If the game crashes, check the game.log.txt file in your Documents/Euro Truck Simulator 2 folder for specific error codes.
The is not a retail product. It is a fossil of development—an internal build that escaped the SCS garage. It offers a tantalizing glimpse of future features (ray-tracing, bigger multiplayer, new map regions) but at the cost of your save file and sanity.