Gran Upgrade Kit - for Gran Eye. For users who have purchased—or are planning to purchase—the older version of GRAN EYE, we offer an Upgrade Kit that allows you to update your setup without replacing the entire unit. The Upgrade Kit is a set of accessories that helps bring the older version of GRAN EYE up to the same setup and usability as the renewal version. It allows users who purchased the older version to upgrade their setup without replacing the main unit.