Here you can find the latest server build available for Space Station 14.
The latest build is from Monday, 05 December 2022 at 10:20 UTC. Pick whatever build suits the operating system you're trying to host on:
The version is 544fc01cde60cc6a332a9c5ed0e043925661825f
If you somehow ended up here without reading the Server Hosting Tutorial, go read that first. It tells you how to actually host a server.