This is a standalone archive release of The Dark Mod's 2.03 update, to be applied to an installation of The Dark Mod 2.0 patched to version 2.02.
To install this update, extract tdm_update_2.02_to_2.03.zip to your Dark Mod installation folder (the one with "TheDarkMod.exe" inside it), choosing to overwrite when prompted.
The primary download page on ModDB for The Dark Mod can be found here:
Update notes for TDM v2.03 can be found here:
Note that I hold no official affiliation with Team Dark Mod whatsoever and that this has been uploaded only in the absence of any other clearly available standalone download source for The Dark Mod update packages.