That's what I did for Arkham Knight Joker and Arkham Knight Batman. It finally worked. I solved it before you could comment. Thanks for the help and again, great mod. Let me know when you release a new one. By the way, you firstly suggested to move all the mods except WLNW and AKJ in another folder and it partly worked; is this because the game reads DLC data giving priority to those that are immediately in the DLC folder rather than those in other folders inside of it?

@Pol74698 You have too many mods. It's not that they replace any costumes, it's that they're not showing up because there's no room to put them. Try deleting some of your mods for Nightwing and Joker, or delete the DLC skins (Red Hood Joker, New 52 Nightwing, etc.)

None of the costumes is Arkham Knight Joker. I also tried to see if he replaced any of the costumes (including standard Joker), but nothing.

@Pol74698 It may be that you have too many mods. If you go on the skin selection menu, and you keep going down, and the indicator eventually disappears, then you have too many skins and they will not all be listed.

It is on Steam. I'm trying what you suggested now

@Pol74698 Thanks for the compliments, and I don't really know how to help you...did you buy the game on Steam? If you pirated it, it wouldn't work, but you should be able to run the mods if you buy the game on Steam. Try moving all the mod folders that you have (i.e. Moving every folder in DLC that wasn't already there to another folder except for the White Lantern Nightwing/Arkham Knight Joker)

For what? It is epic. Now off topic...

I'm an italian gamer and can't get either this or White Lantern Nightwing mod to work (they don't show up in the alternate costume tray). Do you think you can give me any help? I know this isn't the best place to discuss this but I got no answer on mksecrets.com . Thanks in advance and again, nice works!

@Pol74698 Thanks bro!

Epic! :D