The technic isn't the problem, it's the law. And I don't mean the rocket launcher.
First, because of VALVe. Second, because Fallout is not ours. We can't release it on whatever buy/sell plattform. Bethesda lawyers for sure might have something against it-- also VALVe. Beside, you have to own Fallout 2 in order to play FOnline (legally), so this would need to be connected. We can't provide all files for download. /Edit: Also you can't simply download Steamworks. You have to contact VALVe, show them the game, talk about all the legal stuff, etc. pp. It's part of a partner system, after all.
We tried to get 2238 on Desura, but currently this is not possible, because of technical issues (out of our hands).