For users with original physical copies or older digital versions, the following steps are generally recommended:

Execute the patch.exe or equivalent file found inside the folder.

Approximately 3.77 MB for the patch itself, though full game installers containing the update may be much larger. Release Date: December 11, 2004. Installation Instructions

Ensure the installer correctly identifies your FlatOut installation folder.

The update addressed rare but disruptive "Blue Screen" crashes that occurred when the game was minimized before a multiplayer session.