I'm not sure what you are asking about the gun crew and careers, but your download looks good to me.
You should have a half dozen or so crew slots for the deck gun in your crew screen, and when you start a career one of the options offered is difficulty--Easy, Normal, Hard (or something like that) and Realistic. Also, when you start a new career don't forget to reset your game options in the 'office' prior to starting your first patrol.
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