This special Community Builder plugin allowing showing those Downloads that the user has created in from the component jDownloads. Originally created for Joomla articles by Krileon - Modified version for jDownloads 3.9 series. For installation you must use the plugin manager from Community Builder, it is not possible to install it via Joomla installer.
Please see the documentation:
Community Builder Plugin for jD3.9 (opens in a new window/tab)