merin: Any chance this game will come back to GoG? I'd really want to buy it.
GameRager: Not likely, sadly.
As for alternatives, as Post 21 says, Zoom Platform has a likely unlimited term license to sell it, and their installers are pretty decent and support many more OSs(I got one for a game called Curse-Eye Of Isis, which is a good game, and the installer worked perfectly).
Of course please note they only take paypal(afaik) at the moment.
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Also to all who like this game, please note: It has a sequel on the nintendo handhelds. let everyone here know that zoom platform is legitimate, Duke Nukem Manhattan can be purchased there, and it works on windows 10. they also take cards now,