Originally Posted by
Flatballer
"An error occured during the download. Training device download is disabled. You must first select a serial port using Training Peaks WKO+ v3.0 Home."
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When you click on download from device, and the window pops open, in the upper right there is a drop down menu for selecting the COM port. Have you selected one? (I'm not on my laptop that has WKO+ so that's all I can remember.)