Most free ebooks have no DRM, but based on the download page this one is probably a standard "secure" (DRM-laden) MOBI ebook. So, your Kindle PID must be registered (type it into the appropriate web page) with Harper Collins and the ebook downloaded again once it has been registered. Their FAQ says you can register 3 PIDs. Note that many sites don't accept Kindle PIDs, so this still may not work - but if so it should fail when you try to register the PID.
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