By default, the links are limited to one device, so the download will work only once. If you edit the book in your account dashboard and edit the display permissions, then you uncheck the restrict to single device check box. This allows you can then have the ebook installed on 6 different PCs and 6 different devices like phones and tablets. There is no option for a number in between, unfortunately, it's either one device or all of that are allowed. Also, its setup so if you do allow more than one device, all subsequent activations are required to use the same Adobe ID.

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