Downloaded a book on wrong account , now it's gonna get deleted

Hello ! I have a problem . I get one account with ".com" at the final of the account and mail , and downloaded a book , purchased one ... Then i realized that the account was wrong i made another one with ".com" .
I spoked with someone on the suport line and i get my wrong account deleted in one week ... Syncronized the two accounts , https://adeactivate.adobe.com/adept/en/JoinAccountLoginForm.jsp here , i get logged in with my main account and when i want to see the book then logs me with other account ...
I think , normaly , if my wrong account's gonna get deleted i will lost my book .

What i have to do to transfer the book forever on main account ?

(sorry for my bad english)