I thought it didn't need a serial number because of a post by Marco Canto on 30 March, 2017. This post is about components and libraries available on Getit for Tokyo 10.2.
One paragraph, labeled Konopka Controls and Radiant Shapes states
'While they still run a separate installer, this is not asking for an additional license key any more and installs the components only for 10.2 Tokyo'.
I thought the same would happen for Rio.
Before raising an issue with Embarcadero, I thought I would check with others in case I was missing something simple.