I cannot download a book through my Adobe ID

I have recently purchased a book from google books. I can have access to the EPUB, however, I cannot download the book in PDF format which is more convenient for me to read. The problem seems to be this ACSM format or application, which I am not familiar with.

I am attaching relevant screenshots because maybe you can help me solve this issue. 

 

Kind regards,

Maria Emmanouilidou

EFL teacher-PhD