Greetings maxen,
There are two ways you can download the CleanMode Plugin.
1. The first way, as jerome mentioned, is to download the CV-Toolbox.
Link: http://www.cineversity.com/vidplaytut/cv_toolbox
2. The second option is to install it manually, if you only want this plugin.
Link: http://www.cineversity.com/vidplaytut/cleanmode_plugin_part_02
On the left side of the tutorial you will see a description box. To download, simply click the “Files” button.
I hope this helps.
~Michelle