If you want to download the game itself, you'll need to purchase a copy from some online source. Steam has it, and I bought my digital copy directly from the Ubisoft store. There are probably other places you can buy it online, googling it will probably do the trick.
For supply at sea and more ports/units/etc., you will most likely want one of the supermods. There are stickied threads about most of them with download information and installation instructions in the SH3 Mods Workshop Forum.
There is also a stickied thread in the same forum regarding Commander, it's available in the Download section here. It's compatible with the stock game and all the supermods, once you have the game installed you can install Commander to use with it at any time (before or after modding the game).
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