I Installed ADE 4.5 with O/S Windows 10. I purchased eBook from Kobo store and trying to download them to my eReader. When ADE opens, I get a window telling me that there is an update available which I click on. However this is followed by an error message telling me to "check activation". I checked activation and it is telling me that my computer is authorized and I did receive an eMail with instructions on how to proceed. I have tried different version without success. After un-installing them and re-installing the latest version, and restarting the computer, I still got the same results. Anyone else has a similar problem. Looking for some help with my thanks.