To be clear:
Download the game files (torrent links)
Download the server files (github)
Copy and replace server files into the game files
Start the server exe
Login (no need to register)
Choose an online server, or play locally for forever alone mode
If you don't see servers in the server list, make sure your serversList.cfg file in the data folder has entries in it. If not, go ask the thread for server IPs.