Meanwhile I had a chat with Anurag about e_act_too_many_activations (message ade 4.02) while transferring a bought ebook to an updated ereader via usb:
Anurag: For such issue you need to contact Adobe Forums at forums.adobe.com.
Anurag: The issue has already been resolved at Forums.
Anurag: I will Suggest you to refer Adobe Forum for your issue. Our Expert and product specialist team will reply you back via same thread.
As I see other people have the same or a similiar problem. Just fun.