Source: https://dukeworld.com/classic%20dukeworld/tc/zerohour/zerohour.zip

Steps:
* Unpacked zerohour.zip.
* Renamed tiles*.ar_ to TILES*.ART, based on command from zerohour.bat,
and further renamed zerodemo.dmo to DEMO1.DMO and zerpgame.con to GAME.CON.
* Deleted darkness.wrk, zerogame.con,
zerodefs.con, Zerouser.con and the BAT files.
* Created a new archive from the available contents.

Notes: This uses CON code originally adapted for the Atomic Edition v1.4-1.5.
Albeit zerodemo.dmo was made for v1.3d, it was still included after
renaming to DEMO1.DMO (following zerohour.bat), in order to disable playback
of the stock game's first demo in source ports compatible with v1.5's demos.
Like the original files, this still uses v1.3d's title screen without
fixing its palette, assuming an alternative LOOKUP.DAT file isn't used.