i also have to use that link because i download the book using my Iphone.
Sorry for the delay in responding to you.
There is a built in utility to unzip files onto the Mac. But as to unzipping them on an Iphone, I don't believe there is any way to do that at this time, at least "Officially".
I did see some solutions by doing a quick google searh, but I can't attest to the validity of any of the free utilities offered online.
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