Install it manually from the link above, and make sure the Debig logging is enabled.
Now I think that most probably the problem is not in the stock driver, but you are experiencing a Zigbee connecttivity problem with your C-8 Pro hub.
Use the following workaround when pairing :
If after 2-3 pairing attempts (please follow the instructions precisely), the button still does not work, please post the debug logs that follow the start of the pairing process.