When trying to download an ebook I get "Error! Check Activation."

I am using a PC (Windows) and the activation seems all right when checking in the account details.

For this problem, you need to deauthorize and authorize ADE again.
Launch ADE
Help -> Erase authorization.
ADE will be deauhorized.
Now again AUTHORIZE ADE
Help-> authorize computer.
Error will be fixed !!

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