Download Rustbuster serve the latest version and copy the files and replace. i will suggest downloading a pre-made server file the latest version with the latest update of Fougerite version and Rustbuster
Seems like as I suggested the second suggestion that you are not eligible to download the resource. see how fougerite community works are we prefer to know our community a bit better you can not just hop on and download. Go here and introduce yourself...
Go to any resource you need to download and find the like button for the resource or plugin and click it, and after that, you can download the plugin. If still, you can not download the plugin that means you are new and have no posts to make you eligible to download resources.