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Edit: Never mind. I think I figured it out. Sorry for the post.
Post edited October 23, 2014 by bdrke9
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You will find a shortcut in your Start Menu. Check in Gog.com/AvP Classic you should find "Aliens vs Predator Classic 2000 - Galaxy Client"

Run that and the beta client will launch. You may need to set some firewall permissions for Galaxy though.