Need help configuring Xbee

I am trying to create a weather balloon that transmits data wirelessly using two XBee radios as described here,

The problem I’m having is getting X-CTU to communicate with the port the radio is connected to. It keeps saying “unable to connect to com port.”

I believe that’s all that I am having trouble with at the moment. Any help at all would be greatly appreciated.

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Have you tried contacting spark fun for the proper USB driver?