To play it you need eDuke32 (better lastest one with OGG support), duke3d.grp and, preferably (but not necessarily) High-res pack, which may be obtained here:
http://hrpupdate.duke4.net

Installation: 
No need to unzip episode archive, just place files "A.EZ_episode.zip" and "A.EZ_episode.bat" in your Duke3D game folder and run bat file (A.EZ_episode.bat).
If you use eDuke32 mod will run flawlessly.

Latest version (version 1.1 now)of the mod always here:
http://members.lycos.co.uk/piterplus/download/A.EZ_episode.zip

Discussion about the mod on the 3DRealms site:
http://forums.3drealms.com/vb/showthread.php?t=29828

