10, OK I give up….Clean library?

I have been using this skin which first and foremost my hats off to those who created this clean, well thought out skin. I am very happy with it and again thanks to all of you who made this design.

Now to my headache, I have been looking for the “Clean Library” key and I for the life of me cannot find it. I did some reading in the forums here and I am not sure but it sounds like that feature is offloaded to the Library Auto Updater addon? Or is it somewhere in the settings because I cannot find it even in Advanced mode? Maybe the headache is blinding me, but I just cannot find it.

Using Krypton 17.0 with Aeon Nox current version.
Windows 7 64-bit