From the install readme included with the module
1. Unzip the package, retaining the folder structure.

2. Read the following notes before proceeding to copy all the files to your site,
Before copying, take care to rename the "YOURTEMPLATE" folders to match your
custom template's foldername.

3. You need to enable the categories_css sidebox.
Go to Admin->Tools->Layout Boxes Controller and enable the new "categories_css" sidebox.