You must first activate the log option in the jDownloads configuration to use it! When you will change the module output, you can also modify the .css file.
Included are English and German language files.
This module exists in different releases for Joomla 2.5 and Joomla 3.1. So make sure that you download the correctly version for your Joomla.
This plugin is for the jDownloads 1.9.x series only. Do not use for the new jDownloads 2.5 or 3.2 series. The new series comes with some modules and plugins as a part from the installation package.