I have never found a replacement desktop application for Copernic Shopper that wasn't considered malware of some sort.
And if you manage to find an installer for the old Copernic Shopper application, the first thing it will do when it runs is update its search engines, which will result in a single entry whenever you search for a price or review, telling you it's no longer supported and then it refers you to the
Pricegrabber site, as a replacement for their software.