Its the most recent version DLsite has for download, I can't do much but wait until they update it, I'll update the file as soon as I get my hands into it.
EDIT 1; Its the one with mosaic improvement fix, when you compare the store page one and the one in the game, you can see a clear difference on it, and JSK games are known for slowing down after playing those for a while, I suggest you reload the page if you use browser, or restart the game if you use independent flash player after each play through, I don't have any slowdown issues until I reach the final fight or "enjoy" the intermissions between the fights for too long.
EDIT 2; On the side note, I've begun to translate the Fighting / Sex interfaces to English, however the dialogue between the MC and Karen is bit out of my league, as I don't know how to properly read moon runes, but I understand it when its spoken to me, so that's the best I can do for now in terms of translating.