Please?

Error: Missing Executable when I start the game.

I'm getting toward the end of the game -- just finished the evil animal lair and am trying to sail away. But, no matter what, my next battle comes up with a loading error and then Failed to load: img/sv_enemies/Jellyfish.png.

Anyone tried - I assume this uses one of the standard engines.

how do you kill the last boss when you don't get any time to do anything b4 he wipes you out?