Dviant3K: I emailed the devs if it was going to become available for gog users and got this response:
"Hey,
Unfortunately not. It's been done only for charity via Steam and it would be quite complicated to make it stand-alone and DRM-free.
However, huge (and free) expansion is in the works, and should hit GOG sometime in a few weeks.
thank you"
tldr; No.
Thanks for finding that information, it would of been nice if someone from GOG replied to this post... As its for charity how stupid is that you would think that more money for charity would be better. Ah well I'm too old to be surprised by this level of stupidity any more and just hope that some people donate to WarChild from extra DLC through GOG...