"Radimation" device drivers, makes use of external VISA library made by NI. This library must be externally downloaded. You can find the latest download of this library on: [1]
NI-4992 17.5.0 [2]
The Virtual Instrument Software Architecture is a standard for configuring, programming, and troubleshooting instrumentation systems comprising GPIB, VXI, PXI, Serial, Ethernet, and/or USB interfaces.