Problem with Activation Error message

[#1]

Receive a Activation Error trying to download from an e pub link.Have tried removing the activation from DE but it just says come back later (for days!). Then tried the alternative instruction to remove it from the Registry. Followed it and deleted the Key but it simply reappears and the activation option is greyed out.

[#2]

Receive a Activation Error trying to download from an e pub link.Have tried removing the activation from DE but it just says come back later (for days!). Then tried the alternative instruction to remove it from the Registry. Followed it and deleted the Key but it simply reappears and the activation option is greyed out.