I'm running the FreeSpace thingy right now. I'm not sure what it does whilst it counts up through the percentages. But for me once it hits 100% it then starts attacking my free space. E.g. I can see my freespace is not down to 450Mb, so I guess its nearly done.
As this option is quite techy, I think it should provide more debug information as it runs. E.g. creating file that is 1Gb, 1.5Gb, 2Gb etc.
Will be deleting this file soon...
Anyway loving ccleaner right now.
Rob
P.S. Running with 2.17.853, after staying at 100% for quite a while mine finished ok. I had 16Gb free, and strangley 22Gb free at the end. Must be something else.