Here you can find the latest server build available for Space Station 14.

The latest build is from Sunday, 03 July 2022 at 05:07 UTC. Pick whatever build suits the operating system you're trying to host on:

The version is f6bd44114ae47f896b46fba9e91baa8b7ac5c8a7

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.