From: Montreal, Qc, Canuckistan
the game picture is from Harpoon ANW (formerly known as Harpoon 2 & 3), while the demo is from Harpoon Commander's Edition, an offshoot from the original Harpoon PC game, aka Harpoon Classic.
Two different beasts, with two different dev teams :)
That's why you can't make the former look like the latter.
Edit : If you bought Ultimate edition, you do also have the Commander's Edition game, which will look like the demo.
Be Kind. Everyone is fighting a hard battle.