The TDU_PC_Patch_166A.zip file you have requested: Official Patches / Test Drive Unlimited v1.66A Patch (International) - 16.46mb is not available. Perhaps try browsing all files for the game Test Drive Unlimited and upload any files you want to share or are missing. This is the only information we could locate:
Atari has finally released the first patch for its MMO/racing game, fixing various exploits, crashes, and optimizing performance, as well as adding two bonus cars, the Audi RS4 and Nissan Skyline R34. A new Test Drive: Unlimited patch updates the racing game to version 1.66A. Changes and bug fixes are included with the patch, which also adds two new cars: The Audi RS4 and the Nissan Skyline R34.