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If the download link is no longer available, contact support to reactivate the download link [1]. In your email, please provide your library card number and the title of the eBook.
Links:
[1] http://www.hcpl.net/form/digital-media-support
[2] http://www.hcpl.net/faq/digital-media-catalog/ebook-help/computers
[3] http://www.hcpl.net/faq/digital-media-catalog/ebook-help/nook-sony-reader