Manga Downloads has all of the vols of Katsu hosted on thier site, on thie bots, and on their BT tracker.
As far as i know thats the only stable place to get them from, since the other group seems to have died.
But chap 09 11 12 13 & 14 and volume 11 are not enable on DL or BT
Hrm. I'd say the links are just broken, send a PM to the guys at the site to inform them and they'll probably get fixed.