In fact just go here to http://www.warlorders.com/warlords3-dlr/downloads. You do not need any of the patches with Gog's version (and using such will probably make the game unplayable for you) and Molotov's Ultimate Editor is the ONLY editor that actually works without crippling bugs and can do much more than earlier editors could do.
As for the "Hero and Unit packs" just know that many of the early offerings by the NUT team have issues with balance or simpler matters like weird names and such. Those "K4", "Stormheim" and the "X" heroes are mainly of interest to multiplayer Warlorders as these work to achieve balance with these units and heroes.

I have played all of the campaigns there but it has been so long (I only yesterday tested "The Elves Return" and it seems to work) since I played these that I can be of little help with information here. I remember 'Legion of Blood' (IIRC) had an impressive shield customization feature.

Been playing this recently but with a graphics mod Warlords 2 in THREE 1.0--Warlords 2 Style Units/Heroes for Warlords 3,
link on Warlorders.com under forum title Warlords 2 Style Units/Heroes for Warlords 3 (Screenshots):

http://www.warlorders.com/forum?func=view&catid=16&id=3617#3619

It does not change anything about the game, just changes the top down units view to something that resembles Warlords II style units(game also here on GOG). Bought DLR back in the day but shelved it because I detested the top down unit graphics making them MUCH harder to recognize and relate to but have been playing it with the mod and am happy with this game.

Replaces the sprite graphics of Warlords 3 Army and hero units with the style seen in Warlords II classic and Deluxe.
For both Standard and STORMHEIM sets.
NO stats have been changed

Link updated for V1.2 as of Dec 27 2019:

https://www.mediafire.com/file/mo3292h0ytppkyf/DLR_WarLords_2_inTHREE1.2.zip/file

Reskin of Warlords 3 Dark Lords Rising to look like earlierWL3 Reign of Kings (less gloomy and depressing)
http://www.mediafire.com/file/47mkj4ikqwqkbx9/DLR_WarLords_ROH_ReSkin.zip/file

Adds a bulding in the yard of Citadels to more easily identify them from lower level cities
http://www.mediafire.com/file/4s3mmpwhdw8mwv9/Warlords3CitadelBLGs.zip/file

Yeah I saw your post at the Warlorders.com forum. I am interested in this because it would seem to make new units, heroes much easier to make (graphically) and also I have always detested Warlords 3's graphics.

I will download it now.

Thank you SkeleTony
Directions are included in the download how to import graphics into the PCX files, ie upscaling them from Warlords 2 by 150% seems to work fine.

A handy resource is the ARMY SETs from Warlords 2 classic (I do not think it is in any of the scenarios in the GOG version)

http://www.mediafire.com/file/csoaobmnbi20a8e/Warlord2ORIGINALArmy.zip/file

Looking forward to your artwork additions!

Another resource
https://rpgcodex.net/forums/index.php?threads/warlords-2-classic-rebalanced-army-new-maps-a-modification-guide.119634/