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!
🎉 Congratulations, you've successfully updated your server's modpack. If you have any issues or concerns, please contact us through the ticket system.