/vr/ - Retro Games

I was told to ask from here.

So I have Duke Nukem 3D Megaton Edition. I installed EDuke32 so that I can launch it via Megaton Edition start screen by selecting "classic" that would normally launch the original dos version on dosbox. I simply installed EDuke32 to the dos version folder, and renamed EDuke32 launcher to dosbox.

My problem is that I don't know how to install or play mods. Total conversion mods or mods that have new content such as new enemies, guns, graphics etc. don't seem to launch and/or work properly. The new enemies would stay still as if they were just billboards, I can hear the new weapon sounds but there is not difference to weapon skins etc. but everything else that uses default Duke Nukem 3D assets works perfectly.
Mods that are just new maps/episodes that use only default DN3D assets work fine, ie. Duke Hard mod.
I thought I could just extract the mods to addon folder or something so that I could simply choose them from EDuke32 custom game drop menu, but they do not appear in the custom menu at all. With Megaton Edition the classic duke root is located in "classic" folder, so by dropping my mods there they will appear in the custom game menu, but the mods will not work properly/fully as I explained.

I also happened to have that cheap build engine game called WWII GI, and that worked fine as well simply by moving the folder to "classic" folder. At least I know EDuke32 is set up correctly and is able to play custom games. I'm sure that I have just missed a step here, but I have no idea what.
I'm also quite sure the classic .grp duke file I have is the real vanilla DOS version and not some modified version, so there shouldn't be any problems there either.

TL;DR:
I don't know how to play mods with steam EDuke32, guides don't help.