Book display only page number but not the content

[#1]

Hello, I have download a book with acsm link. The title, the author is well display but when I try to read the ebook from my computer windows 10 it displays a grey screen, only page number. If I send it to my kobo h20 it is the same problem.

What's wrong ?

Best regards.

[#2]

Hello, I have download a book with acsm link. The title, the author is well display but when I try to read the ebook from my computer windows 10 it displays a grey screen, only page number. If I send it to my kobo h20 it is the same problem.

What's wrong ?

Best regards.