While the game is no longer sold on major storefronts like Steam or Epic, you can often find the "Gold Edition" (which includes extra tracks and bikes) on specialized sites:
A common source for downloading old PC titles that are no longer commercially supported. moto-racer-3-free-download-pc-game-full-version
Searching for a usually leads to legacy gaming sites or community archives, as the game is considered "abandonware" by many fans. Originally released in 2001 by Delphine Software, this cult classic remains popular for its variety of motorcycling disciplines. Game Overview While the game is no longer sold on
High-speed street racing on closed circuits like Suzuka and Donington Park. moto-racer-3-free-download-pc-game-full-version