I see you beat me to make this server build known.
To answer your question where you can download it - you don't have to. Just connect using the
stable Skulltag 98d client as you would on any other 98d servers.
I'm assuming you don't have 98d installed at all. It's pretty troublesome now that there are 2 different program versions in use (98d and 1.0 alpha) due to the migration from Skulltag to Zandronum... Keep in mind that 1.0 alpha is just a testing version though and is not fully supported by all server browsers yet. I will run 98d until either 1.0 stable is released or the alpha is fully supported and the playerbase is aware of the migration.
kpatch is a version of skulltag-server enhanced and customized to my liking. Mainly for myself to keep track and gain some experience, but perhaps I'm not the only one who will find these changes useful, and who knows, maybe some of them will be considered for adding to Skulltag...
In other words, it's a server patch for 98d "developed" by myself ("developed" because I'm not really a coder, I'm just learning). It adds server-side features and bugfixes from 98e/1.0, as well as 3rd party features such as country database showing player locations on connect, or Dusk's password list system. My aim is also to facilitate server management. Currently I'm making an IRC bot that would interact with servers.
Besides GV, StasBFG runs this build on iddqd servers. I guess I could release the binaries if there's interest.