From Stunts Wiki

The game has been declared freeware and can be freely distributed. You can download every currently known PC version on this page. The downloads are ZIP archives which contain a crack (ST.COM) suitable for the included version and are otherwise unaltered, i.e. no tracks have been added and nothing has been patched or modified.

To start the game, either run STUNTS.COM and use the lists provided above to look up the correct copy protection answer, or run ST.COM if you don't want any copy protection question to appear at all. Note that you'll need DOSBox to play Stunts on a modern system.

Links offers the original Stunts v1.1 (directly copied from retail discs) as well as altered packages of Stunts v1.0 and 4D Sports Driving with added tracks and modified cars/opponents.