Ah yes, that readme file is probably from the original game, but I'm 99% sure (as Mighty Midged said) that the game is already preinstalled - so you only need to unzip and play (if there's no sound you may want to reconfigure, but it's optional).
Acctually by trying to re-install the game, you can mess things up and will have to delete the folder and start from the begining.
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