Overview
Plugins on Minecraft servers generally go out of date with large game version updates to the base game or the plugins themselves. An out-of-date plugin can cause a lot of problems on servers. Fortunately, they can be easily updated by following the same process as installing them.
How To Update Plugins on a Minecraft Server
Step 1. Download the updated version of the desired plugins .jar file. 
Step 2. Log in to the Multicraft panel.
Step 3. Stop the server.
Step 4. Choose File Manager.
Step 5. Locate and open the folder labeled plugins.
Step 6. Select the out-of-date plugin, and choose the Delete button.
Note: Make sure to download backups locally to avoid losing unnecessary files.
Step 7. Choose the Upload button on the top menu.
Step 8. Drag and drop the updated .jar plugin into the dropbox. 
Step 9. Once the plugins are uploaded, Start the Server to load the new versions of the plugins.
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