Should work. I'm on win10 and using the Hauppauge tuner card. It works for me so I would say it's not a Win10 issue (unless something didn't go right with the install).
When you go through the JRiver TV setup, (1) first you scan for channels, then (2) you select an epg data capture method (like mc2xml), then (3) you select the source for the data (like Microsoft and Broadcast), and lastly (4) you match the channels to the EPG data (like channel 6.2 is WDBO-DT2).
How many of these steps completed?