Norton utility 5 for MacOs 10.7.5

Why does Norton still advertise Norton utility 5 for MacOs 10.7.5 on its Web site as available (released July 2016) when in fact, it is not available neither supported anymore... My iMac, late 2006, 2.16 GhZ, Intel Core 2 Duo, 2 Go memory, MacOs 10.7.5, not upgradable, cannot be supported by Norton 7. Any suggestion for protection? Jacques