GlassCliff

When you first launch CCleaner, the first option (Cleaner) on the left side tab bar is selected by default. This is where the "Wipe Free Space" option appears and you need to select the corresponding check box. That's what Augeas is referring to. It's the last option at the bottom of the list. After that you'll need to select "Run Cleaner" at the bottom right of your screen for it to start. BEFORE this you must select the drives you want it to wipe, which is under Options, Settings at the bottom right of the text.