I used the nw.js ver 12 for the mac fix that worked for my game.
the c2 runtime files in \osx64\eternalstep.app\Contents\Resources\app.nw after export.
funnily enough I have had no error posts on my game from macs with that shoddy fix, just from pc which obviously you will get every now and then because its pc.
shouldn't matter about size that much with my game being 280 meg with over 5000 frames on animation at usually 128 by 128