Oh, have you managed to get the game working then? I just replied to your download problem thread. Anyways, as .Iceman said, there's a button on the game selection screen. If you don't see it, you may have an old copy of the game, but seeing as the last update was released 8 months ago, that's highly unlikely.
If it helps, here's an animation. If your screen looks any different to below, then you've got an old game version.
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