Mount combo (USB/COM) device
Please try install this driver:
https://www.pololu.com/file/download/48014_SiLabsUSBDriverDisk.zip?file_id=0J547

I have a amateur radio which uses a similar driver (CP210x USB to UART Bridge Controller) and I had to install it too...

EDIT:

Actually the driver is the same for CP210x and CP2102...