I downloaded the demo around 2 years ago, used it up instantly, I just bought it and activated it and the first thing out of my mouth was "Wow!" because I still had people alive and it was on 2x speed and running! There were alot of dead ones, but otherwise it was as if I'd never left it!
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Things may seem grim and down, but if you wait it out often things will often appear in a new light.