If you want an offline, fully unlocked version with no online requirement, sadly, even the official v1.478.564.0 still pings Microsoft’s servers for rewards. There is no “offline mode” that unlocks all cars—only the 198 or so standard autoshow vehicles.
Released on March 9, 2021, was the last official update for Forza Horizon 4 before the development team fully transitioned to Forza Horizon 5 . For players who own the Ultimate Edition, this version represents the most stable, feature-complete, and content-rich iteration of the game. Forza.Horizon.4.Ultimate.Edition.v1.478.564.0-P...