I've download the 6/7 rars files.
This mod give me the Shadow6.gif error so i resolve this with the "Shadow6 mass duplication" trick (lol) and now works perfect.
Nice gfx, nice custom edit sprites but with a little bad animation.
I reckon the "super special Hokutoy's Shadow6 ninja supremo arcane dark art" trick should be in a sticky so other people will know and then change their pak files accordingly.