The "Year One Edition" DLC check is aggressive. If you change your PC hardware (e.g., CPU or motherboard), you must re-run the steam_emulator.ini fix or the game will think you are a new user and lock the DLC cars.
DIRT 5 emphasizes social play, offering both local and online competitive modes: dirt 5 year one edition multiplayer dodi re updated
: Based on the Razor1911 ISO, version v1.2767.60.0 . Installation Requirements : The "Year One Edition" DLC check is aggressive