There is no individual serial code in the Voice (Amy, Chris, Kaori, Ken) attached to VOCALOID5.
After installing all the voices, execute authorization using the serial code of VOCALOID5 Editor.
Then Amy, Chris, Kaori, Ken will be authorized.

On the other hand, CYBER DIVA II, CYBER SONGMAN II, VY1, VY2 included in "VOCALOID5 Premium", those are necessary to execute authorization using individual serial codes distributed at the time of purchase.