Peter,
I am presuming you are using a classic Radarbox in my answer.
3D is no longer available due as Ingo states to Google withdrawing support of the plug in. While it is still written into the software of V5 and back it does not work for this reason so you will only have the classic map view option. As it was withdrawn there is therefore no Option for it in V6.
V6 was designed to allow dongles to work with it therefore as you have Radarbox you are better staying with V5 which you can get here
http://www.airnavsystems.com/download/ANRB/ANRB50072Setup.exe Install any version to the root directory i.e. c:\Airnav do not use the program files location as this causes issues with the Windows virtual store
Use the latest drivers from here
http://www.airnavsystems.com/Download/ANRB/Drivers/ANRB-Drivers-20161222.zip Please remember they are zipped so will need to be unzipped into the Radarbox/Drivers folder and then installed through Control Panel.
Can you advise what you mean by Radarbox integration is not available as I don't understand what this means. 3D was only available as a subscription option, did you previously have this option.
I have V6.00.00 installed on one of my laptops to enable dongle use and I have found that it the start up hangs as you detail that if I use control/alt/del to stop the start, when I restart again it then starts up with no issues.
Alan