http://www.cbrandon.com/vids/Ultimate%20Guide%20to%20Unitrunker_RTL-SDR%20V4_Advanced%20Trunking%20Setup.mp4
Use zadig
Zadig is a Windows application that installs generic USB drivers, if Unitrunker can not see the dongel
https://zadig.akeo.ie/
Change serial Number of the dongle
Un-zip RelWithDebInfo.zip.
Go to folder x32. You will find many rtl tools in it as shown in screenshot below.
(http://www.cbrandon.com/vids/ChangeSerial1.jpg)
Open the New Text Document and type
rtl_eeprom -s 00000000
(http://www.cbrandon.com/vids/ChangeSerial2.jpg)
Save the file as change-serial.bat
While saving, make sure that
1. File name contains .bat at the end
2. "Save as type" is selected "All Files"
Please see screenshot below.
(http://www.cbrandon.com/vids/ChangeSerial3.jpg)
Double click the file change-serial.bat to run it
(http://www.cbrandon.com/vids/ChangeSerial4.jpg)
Upon double clicking the file change-serial.bat, command console will open, with last line asking confirmation to change serial number.
Type y and press Enter key. The serial number will change and command console will close immediately.
(http://www.cbrandon.com/vids/ChangeSerial5.jpg)
To check if the number has actually changed, again double click the file change-serial.bat, and it will show changed serial number.
Type n and press Enter key to close console