Bukkit

Setup is Simple:
1. Drop CombatTag.jar into your plugins folder
2. Start and stop the server once
3. Edit the newly created settings.prop (use http://dev.bukkit.org/server-mods/combat-tag/pages/config-file/ as a guide)
4. You are done

Moving up from Combat Tag 2.9 or before?
1. Delete old CombatTag.jar file
2. Delete old combattag directory
3. Follow Setup above