If your talking about the wii, you can't download it. To play it on the wii, you have to have the game for gamecube, a save card, and a game cube controller.
Nintendo Eshop for $49.99
On the Wii U, you can download Windwaker HD on the Nintendo Eshop
They have remade the Legend of Zelda: The Wind Waker for the Wii U in HD graphics.
In the accepted Zelda timeline, Phantom Hourglass is after Wind Waker. When talking about release dates, Four Swords Adventures is after Wind Waker.
A Few
no
wind waker
no
nothing
Wind Waker
No, Link will not age in this game
yes there is for the Game Cube