For the "Update Modpack" button to appear, you need to have installed the modpack through the built-in modpack installer in order for it to work. Additionally, the latest modpack needs to have a server pack attached to it.
How To Update The Modpack?
- Head over to the Game Panel and close your server.
- Navigate to the Version → Modpacks tab. From here, you can click on the Update Modpack button.

- Wait for it to finish installing the latest version of the modpack and start the server!
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If you still require assistance, please get in touch with our support team by opening a ticket or by joining our community Discord server.