The links are dead now but I found Release 6

[75]

To be clear, this mod is the one that has three classes to choose from and has maps MAP01-MAP07, the first map looks like this:



Download Links:

ifocserv.net:

The IWAD (revision 2): http://ifocserv.net/ftp/Random/TNCQG2IWAD.wad

The PWAD: http://ifocserv.net/ftp/Random/TNCQG2_R6.wad

CQFF:

The PWAD: http://www.chexquest.org/index.php?action=downloads;sa=view;down=156
The IWAD: http://www.chexquest.org/index.php?action=downloads;sa=view;down=155


Note: Confusingly there is another mod by Slime named "The New Chex Quest Generation 2", it has completely different maps, I backed up the files for that mod too, you can find it here:
http://www.chexquest.org/index.php?topic=3930.0

Edit: I found release 6 on the Chex Quest Gallery: http://gallery.xboltz.net/getwad/

I backed up the wads on my server and on the CQFF downloads page too, just to be safe.