DBW (a.k.a. Dark Blue World) is a mod pack designed to be used in conjunction with Ultra Pack 3.0 RC4.
That being said, they have an all in one Super Modpack that will take a clean, stock install of the base game, IL-2 1946, from whatever source, whether that is DVD or whatever, and bring it up to a full Dark Blue World 1.71 install. You also have the option, through a selector program they provide, of playing any one of a number of different 'versions' of the game, from Stock 4.101m, to UP 3.0, to DBW, to DBW 1916 (a.k.a. WWI) and I hear they are working on a Jet mod for those looking to fly Korea.
You can find downloads for it on their website. You can also find the 19 parts of the Dark Blue World F'n Big Super Mod Pack in the downloads section of my squads website, as we fly with Dark Blue World. You can send me a PM if you have any problems, I would be more than happy to help.
There are a ton of added planes and other effects, including an improved AI for the enemy. For an offline player I would also recommend DCG and the DBW update for DCG (this gives you a ton of options for whatever campaign type you would like to fly).
Also, if your at all interested in flying with a group in a Co-Op campaign, against AI opponents, RAF-65 is always recruiting. You can check us out at
www.RAF-65.com.Best of luck, and let me know if you have any questions or if I can help with anything.