There are two different types of package for
THF, the client's files
(maps+skins+game messages+sounds+textures+icons) and the server's
files (just the server's dlls). In order to run a server,
you will need BOTH the client's and the server's files. If you
just want to play, then you only need the client's files.
Install instructions:
1) Unzip all the files in your Heretic II
folder
2) Open the "autoexec.cfg" file in your "heretic2/thf_5"
folder and modify the bindings it to your likings.
3) Copy/paste the "gamemsg.txt" from your "THF_5"
directory to your "base" directory