dvip
In the File Browser.
I just tested Purge RAW with a590-101b-0.9.9-1152-full.zip and it didn't work.
It works fine if you select all files (Select inverse) and do a delete.
FWIW purge raw is only supposed to delete raws that do not have a jpeg with the same number (can happen when you delete jpegs with the canon UI)
It should also work on the entire DCIM directory, or an individual NNNCANON sub directory.
Anyway, if it didn't trash your filesystem, I guess that's a good sign.