Calibrating Transmitter in Mission Planner

I am having troubles getting the transmitter to calibrate in Mission Planner. I am using a RadioLink Pixhawk controller and a Radiolink R10DS receiver with a RadioLink AT10II transmitter. All the set up went good until I got to transmitter calibration. Anyone have any ideas? I am running windows 10 operating system, anyone else have trouble running Mission Planner with windows 10? I tried disabling anti-virus, that didn't work. Any help would be appreciated! Thanks

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