Game Servers:How to update my server

From Serenity Servers Support

Updating your gameserver is easy, most games we sell are downloaded through steam.

These games are also updated through steam, so all you have to do is on your gamepanel locate the button called Steam Update this will validate and update any outdated files on your server.

This method only work on steam games, other games may require you to install a new mod or reinstall a currently installed one.
This is how Minecraft mods are updated.