Once you click the button, you'll see the message shown in Figure C appear on the screen. (I've magnified the message so you could read it.) When I first read the message, I was confused. Thinking that it must be a just in case disclaimer type of message, I went directly to my email and clicked Send/Receive a couple of times, sure that the email would appear. But it didn't. In fact, I didn't receive the email containing the product key for close to 48 hours.
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