I guess you have downloaded and extracted the 64bit drivers to somewhere on your computer.
Now go to Devices and Printers and you will find your Radarbox probably under unspecified.
Right click on it and in the pop up window, click on Properties, now click on the Hardware Tab, then Properties, then Change Settings, then Driver, then Update Driver, then Browse My computer for Driver Software, Browse and direct the box to where you have saved the extracted drivers too and once you have done that press Next and your drivers should install.
Alan