I don't really think that would be possible. Updating it to the website is one thing, but updating it onto other people's computers is another, and one that probably isn't doable.
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It's impossible to do that unless you install a virus onto their computer that connects to the internet.
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All they have to do is tell everybody it is updated so that they can download it again...But other than that...it's pretty much impossible.
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You want this closed? Because it's impossible. :P
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