There was a error using this device

VirtualHere USB Server: 3.6.6 (Windows 64-bit)
VirtualHere Client: macOS

I am trying to access a VISA device (specifically, a B&K 9201 power supply) using VirtualHere. The device is physically connected to a Windows computer, and I am trying to access it from my MBP. The client on macOS pops up an error window "There was a error using this device." The server on Windows shows the following in the server log:

2018-05-30 11:41:39 INFO :Installing driver for class USBTestAndMeasurementDevice {A9FDBB24-128A-11D5-9961-00108335E361}
2018-05-30 11:41:39 INFO :Downloading https://www.virtualhere.com/sites/default/files/usbserver/windows/win64/drivers/vhsd_usbtestandmeasurementdevice.sys
2018-05-30 11:41:39 ERROR :There was an error downloading, HTTP response code said error (404)
2018-05-30 11:41:39 ERROR :Could not install driver for class USBTestAndMeasurementDevice
2018-05-30 11:41:39 ERROR :Error binding device 3 [ffff:9200] to connection 2, BIND_ERROR

Any assistance would be greatly appreciated. I have used VirtualHere in the past without issue, mostly with virtual COM ports.