Both titles have been merged onto one CD containing a new setup routine which installs them both. After the installation, a new launcher screen allows for easy choice of whether to start the original game or the expansion.
Both, the original game and the expansion, have been updated to versions 4.0 and 2.0 respectively. As of July 2010 the only remaining officially released update not included in the retail package is the "Win 2000/XP Update" (version 5.0) compatibility patch for the base game, which does not alter the game mechanics. However, the GOG.com digital release includes it.