Note: This procedure involves editing a game file; create a backup before proceeding. Use a text editor to edit the "user.cfg" file in the game directory. Add the following lines to the file, then start the game and begin a new mission.
play starting_mission 16
Alternately, install Dromed from the Goodies folder on Thief Gold disc one. Start Dromed and open mission 18. Press ALT + G after it loads to enter the game.