hello folks. i was just curious that if i have "duke it out in dc" or any of my old addon packs if i could simply install them like the olden days and have them working. thanks

If you use the DOS version that GOG have provided (uses DOSBox to emulate DOS) then you might be able to install your addon pack, but you'd have to do it from within the DOSBox environment. I've never tried this so I don't know how difficult it would be but maybe some folks on here could give advice?

That said, if you can extract the expansion's files (there are extractors on the internet) then you can get the GRP file out of it and then load it as additional data in eDuke32 (I have tried this and it works).