Changing what your Minecraft server is running (the JAR file)

1. Stop your server.

2. Login to FTP or use the file manager.

3. Get bukkit or Spigot

4. Delete your old minecraft_server.jar file.

5. Upload the new jar file.

6. Rename the jar file to minecraft_server.jar (very important jar name is the same as before).

7. Start your server and you will see the plugins folder and other folders build.