I tried the bugfix mod and it's very good, I can see a noticeable difference in game-play now compared to the un-fixed version. As I mentioned in my edits in the first post I've managed to include the Heroes, Massive Battles and Fortress mods, they all work, except that when I click on any units while the Heroes mod is active, even units that didn't receive any levels, show their actual level as something like "$560000008", so I don't know what went wrong, probably some line in one file somewhere I should edit, but the actual HP gain and ect from new levels work, it's just the name of the level that's screwed up, I'm not sure why, any ideas?
Glad you're enjoying the mod. Personally, I like the fact that Celestians actually work correctly the most. Although I suppose if I played Eldar more, then the working Dance of Death would be better (by the way, that's re-enabled for the DoS AI in this mod since it won't kill its resources).
Anywho, I'm betting the error you're seeing is due to the Heroes mod adding some lines to one of the two ucs files, or even creating its own UCS file. $560000008 is WELL beyond the normal range of UCS values used in the game, so the mod likely includes an extra UCS file in the mod to contain those lines of text. Assuming you're just copying the mods straight over from their normal install in the Dowai_mod folder, then look in there. There should be a locale\english folder, and in there should be a UCS file that is NOT DXP2.UCS or DXP2_VO.UCS. Copy that extra UCS file into the same subfolder in the bugfix's mod folder and you should be all set.
If there isn't an extra file, then the lines are just tacked on to DXP2.UCS. Go into that file using a standard text editor, find the extra lines (they'll be the ones with ridiculously high numbers), and copy them into the matching file of the bugfix folder. Unfortunately, you'll have to redo that process when the next version of the Bugfix mod comes out (maybe this one will actually be after the patch, who knows), unlike the above process which wouldn't need repeating.
One of those two should do the trick, hopefully the first one.