Which error message you get exactly?
Following messaging window pops up:
Activation Server Error
Code: E_ADEPT_REQUEST_EXPIRED http:// adeacitvate.adobe.com/Adept/activate2016-01-19T 10:4719-08:00%20(14532292390009520is%20before%202016-01-19T11:19:58-08:00%20(145323119814 2)
Many thanks for your help!
Check Time, Date and Timezone. On of this are cause the error.
Nanaky - you are a Star!
The time setting was one hour behind. After resetting I could authorize Adobe Digitial Editions.
Thanks a lot for your help!
You are welcome.