If you are an offline player or archiving game data, v.1.405.2.0 is considered the most stable build before the massive Rally Adventure DLC introduced new physics bugs. It is the "director's cut" of the base + first expansion experience.
At this version, Hot Wheels was fully mature. The initial bugs (cars falling through the track, speed glitches) were eradicated. Furthermore, Expansion Two: Rally Adventure had been announced but not yet released. This means v.1.405.2.0 is the last version where you can enjoy the base game and Hot Wheels without the overhead of the Sierra Nueva map. Forza Horizon 5- Premium Edition -v.1.405.2.0 ...
Double your race rewards (CR), get exclusive vanity items, and enjoy three exclusive Forza Edition cars. If you are an offline player or archiving game data, v