I have a book already downloaded to my IPAD and IPHONE; when I open my PC I am not getting the book nor the possibility to download it

I have a book already downloaded to my IPAD and IPHONE; when I open my PC I am not getting the book nor the possibility to download it.

also I tried to download it directly from the seller link to my PC; I am getting the following error:

Error Getting licence_License server communication Problem:

E_ADEPT_NO_TOKEN