You can get the official stable releases of Kodi 16.0 from Google play and also the Kodi website.
The droidbox badged version based on spmc (droidbox media centre - dbmc) is still at 15.2 I believe.
I don't think spmc on which it is based has a stable 16.0 yet.
Dave, you might be able to confirm this, but I am not sure if an official Kodi release (e.g 16.0 rc 1 or even stable 16.0) installs over the top of dbmc or spmc. I believe they will be a separate instance and you will have two Kodi versions installed.