I did install ADE first and did find the DRM epubs. I also pulled those into Calibre and saw the same thing: can't open or convert because of DRM. Of note I have not configured the Obok plugin because I don't have a Kobo device, but DeDRM is setup as I followed in the post above.

The second quote I can't figure out how to use. Doesn't seem to have an executable and isn't a Calibre plugin as it isn't a .zip.