This is the note displayed on the official website when you are trying to access it:
After many years, support for Copernic Agent ended on January 31st 2014. The various engines behind Copernic Agent are no longer updated or fixed. Since September 30th 2014, all versions of Copernic Agent are no longer available for download or purchase. Copernic no longer supports, updates or provide technical support for Copernic Agent. - Copernic website
As you can see, there is no possibility to download the software anymore or to obtain updates.