Descent II feels more like an expansion pack than a sequel and that's because it's pretty much the same engine with minor cosmetic enhancements.
On the good side, the new weapons are more powerful, the new enemies are cool and the maps are bigger—and now you can go back and revisit secret levels, sometimes from different maps. On the bad side, the Guide-Bot is annoying, the secret levels are for the most part confusing if not frustrating and the ability to destroy lights may look cool but it makes navigation difficult. But all that is nothing compared to the Thief-Bot. This character is so detrimental to gameplay people are still complaining about it in the new millennium (like in this blog post). It would take three years before gamers got the sequel they deserved with Descent 3, but in the meantime Descent II kept the franchise alive and it did a good job at that.
CD imaged as a bin-cue pair and compressed with OS X zip. Just unzip and burn with Toast to make a CD that contains both game (version 1.2) and audio partitions.
[Top DL]: Unpacked copy of the game. No installer, just drag-n-drop to play.
[2nd DL]: The full game CD with music.
[3rd DL]: This download is an updater.
[4th DL]: The PC version of the game cutscenes, for use with D2X-Rebirth.
[5th DL]: The Vertigo Series game addon for use with D2X-Rebirth. OS 9 compatibility unconfirmed.
To run this in Mac OS X, you'll need the DXX engine.