Hope you have some extra room on your hard drive. Technically, Marvel Civil war is seven special edition comic books, but the story is fleshed out in basically every other comic of the time. So this is every single related comic, in order, from beginning to end.
The story is about a Superhero registration act being put into place by the government to keep superheros from running wild. Some heros accept this as a logical step, others consider it an unfair, illegal, or dangerous act and fight against it. Causing a "war" between the two sides.
As a final note, I did NOT scan or organize the torrent for this, that was done by somebody else. I'd normally give credit, but the torrent doesn't say who made it either. It shows the uploader, but they state they didn't make it either.
Wiki
Comicvine
Download .Torrent
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Part 1
Part 2
If you happen to be a "Premium Member of Megaupload" you can download the entire file
HERE
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