2015's General WarT sends along the version 1.04 server patch (as well as the source code) for their official Sin mission pack, Wages of Sin. Here's a local copy of the patch (789 KB), as well as a local copy of the server source (803 KB), as well as mirrors. Here's the word on the new version:

Here it is, the unawaited, yet still cool WOS 1.04 server patch. This adds some spiffy new things from Sin 1.04 such as reduced weapon latency and client-side death messages, as well as adding a bit of it's own with Message of the Day support for multiplayer servers and the necessary handful of misc. code tweaks.

If that's not spiffy enough for ya, then here's the long awaited WOS 1.04 source code as well. The first time in history that a new game patch is released along with its source code at the same time! :-o I think it might also be the first official add-on patch ever, but I'm not sure on that one.