Eyestabber Realizing that I had upgraded GZDoom
without testing AoD, I did so... and it doesn't work anymore (GZDoom 3.2.1.). Strangely enough my backups don't include my GZDoom folder, so I can't give you the exact version number, but I was using a SVN release of GZDoom from at least a couple of years back. The readme states:
You must use GZDoom >= 2.1.pre-901 or Zdoom >= 2.8pre-1399.
So that should give you a frame of reference of what version to use. Try finding a 2.8 version of GZDoom and see if that works.
EDIT: The above info is for AoD v6.06. There's a newer version out that I haven't tested, and it states that it needs GZDoom 3.2 or higher.
As for me, I'm currently having a go at the latest Brutal Doom beta with Hell Revealed and Hell Revealed II. Had to stop on HR because I'm encountering a bug where I can't disable the 'feature' that rocket boxes can be blown up like barrels... because MAP15 places rocket boxes on every single teleporter pad in the outer circle, and teleporting onto those pads counts as blowing them up, making every mandatory teleport a certain death. But before I quit I had a go at MAP31 and MAP32, because I remember them from when I played through HR with AoD. The AoD weapon is all about options, you will encounter over 100 different enemies (with some needing special tactics to kill) but you should also have several dozen weapons and items to choose from... meaning you literally have a weapon for every occasion. For MAP31's descent, you're gonna need some of the more oddball ones. You can either ride the lift all the way down and kill the mobs as they spawn, or do it the safe way and stay up at the top and rain down fire from far above. AoD gives you a nice range of gear for that purpose, whether it be one of 3+ grenade launchers, a Heresiarch dropped in their midst who does the fighting for you, or if you just fire a couple of rounds from the true BFG10000 and annihilate everything due to the long way down.
Brutal Doom however, doesn't give you such luxuries. Your best options are the BFG and the rocket launcher (the grenades are on a timer so they explode long before they reach the baddies). For that you have to stand right at the edge of the pit, and that means everything down there can (and will) fire back at you... including the 8 chaingunners that join the fray at the very bottom. Now I'm not 100% certain on this, but it seems that when the lethality of their miniguns is taken into consideration, the z-axis is not factored in... so even though they're firing half a mile up into the air, their shots count as if they're at point-blank range. Meaning you'll get torn apart in about a second if they get a chance to rev up their guns.
Also, I came across that bizarre bug again where a Revenant became unkillable on MAP31. It only seems to happen under those exact circumstances (Revenant, MAP31, v21 version of Brutal Doom).
As for MAP32 - no comment. It's probably doable (as sometimes you only need a single BFG shot to frag a Cyberdemon) but I didn't feel like it.
Hell Revealed II, however, is proving to be much more entertaining under Brutal Doom. The exploding rocket boxes are still a problem here, but it's not a game-breaking factor... yet. Currently on MAP20, but I gave MAP31 and MAP32 a pass after having a go at them for testing purposes. MAP31 slowed down to a crawl in one place (which can happen quite frequently in AoD) which rendered that fight unwinnable, and MAP32 starts that way and keeps that way through the end. Don't even think of trying that one in Brutal Doom... but both aforementioned maps are awesome in AoD, and a true test of your arsenal.