I also don't know what goes on, but I would first try to use right thread, i.e. KSM thread here:
https://www.mobileread.com/forums/sh...d.php?t=293804
Also, if for some reason KSM 9 doesn't work for you, you can use KSM 8, or even 7 (main difference is that KSM 8 places some crucial files on system partition, so it can cleanly unload files on user partition when you access it). And yes, I'm not sure if maybe KSM 7 asks for koreader dir to be in adds or kobo folder, it's too long time ago when I used it.
But, better to ask for help from tshering, as he is author of KSM and know more.