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I have the original Civilization II with following addons: expanded original game (after ship/s arrive on other planet, the story and researching goes on+5 or more alien races), The World of Midgard (4 fantasy worlds, which, I guess, is the same as Fantastic Worlds, perhaps little more units / technologies / terrains) and The Universe of Lalande 21185 (science-fiction worlds, far future on 4 different planets, completely other technologies to research, completely other units / terrains).
The addons have to be installed with the default Civ2 together though, but you can choose if you install them and which ones you install (all 3 or 2 or just one of them). The game with 1 addon would be at least 80 MB large though (not sure the exact size now).
If there's need in the game+addon/s, I could upload it.