On a B42 update you will also have to update the zomboid version. View that article here B42 Zomboid Update

Step 1: Download the Update File

Download the latest update file from Nexus Mods or locate the B42MP.jar file in your Project Zomboid folder.

• If using the update file: Extract b42mp.jar from the downloaded RAR file
• Or you can locate your Project Zomboid folder using the launcher or through Steam

Launcher Method:

B42MP.jar file location in folder:

Step 2: Access Your Server Files

Locate the server Project Zomboid folder at path: /container/projectzomboid

Open your server files through Legion GPanel or use SFTP.

Using GPanel:

1. Click Files
2. Click the projectzomboid folder

Step 3: Locate the B42MP.jar File

In the server Project Zomboid folder, you should see the file B42MP.jar

Step 4: Upload the New Version

Upload the B42MP.jar file using one of these methods:

• Drag the B42MP.jar file from your computer directly into the browser window
• or Click the Upload button and select the B42MP.jar file
• Wait for the file to upload