Wireshark 3.0.2 win10 usb com port not showing

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Hi I just downloaded and installed Wireshark is 3.0.2. 64 bit on Windows 10. All seems ok but the Com port COM4: does not show up on the list of devices. The Ethernet adapters and raw USB are selectable, but USB Com 4: should be there. After that hurdle, I will be sampling BACnet MS/tp RS485.

Please help

Boyd