: A free, older "Legacy" version (pre-Steam release) exists for archival purposes, though it is much older than v0.19 and has limited online functionality.

This specific update was a patch for the expansion, which introduced:

: For those hosting their own online sessions, the Barotrauma Dedicated Server tool can be downloaded via SteamCMD without needing to log in to a Steam account. Version 0.19.14.0 Highlights

To play Barotrauma online with modern support, you should use the current stable version available on major platforms.