Downloaded Setup-bundled-0.0.2-20160331-23.exe
Logged in using my RHD credentials

On the Confirmation step of the installer, I see an unchecked box for ORACLE VIRTUALBOX v5 and an unchecked box for "I want to use the existing VirtualBox".
I can't check either of them (when I cursor over them I see a red NOT circle) so as a result the "Download & Install" button is greyed out - it too has a red NOT circle when I cursor over it.

I have VB installed here:

C:\Program Files\Oracle\VirtualBox\VirtualBox.exe

Version 5.0.16 r105871