Hehe, all of 'em? Sorry. :P
Segmentation faults are rather uncommon outside of Android (and even there I've never experienced it myself).
Here's a link to the old stable. There haven't really been any Pocketbook-specific changes since that I can find in the commit log so I don't think it should do much better or worse.
https://github.com/koreader/koreader...2015.11-stable
My *ahem* source of potential
Pocketbook problems doesn't really seem to have any issues with KOReader.