PW2 Kindlet Jailbreak

I've been trawling the forums here for the last 2 hours but I can't find an answer to my question so here goes...

I installed collections manager a long time ago and it was working fine until a few months ago when I started getting the kindle jailbreak required message. I found the K5 MKK but I can't find one for the PW2... Can someone enlighten me as to how I can install it please?

Thanks!