It kept trying to launch with an older version of GZdoom. Just deleted the older version off my PC and it worked. I was too interested in the error message to realize what version of GZdoom was actually launching. lol
The mod's a lot of fun, certain enemy HP's keep throwing me off. I keep psyching myself out thinking they're gonna go down sooner or later than I expect. The Plasma gun replacement seems a little strong, and the chaingun replacement a little weak but that's a personal gripe. Good stuff Scumhead. A fun way to kill an afternoon.