Adobe digital edition 4.5 not working

[#1]

I purchased a ebook and I have to download it using adobe and I have not been able to download it because of a code E error. It says activation server error bad device key. I have tried the cmd, shift, D and that has not worked either im not sure what to do. 

[#2]

I purchased a ebook and I have to download it using adobe and I have not been able to download it because of a code E error. It says activation server error bad device key. I have tried the cmd, shift, D and that has not worked either im not sure what to do.