The driver should automatically be on their. But you could go to your device manager and make sure your connected to internet and then if you see anything will a yellow explanation point, right click on that and click update. Then just choose find automatically, which is the first option I believe. Or if you want to do it manually, I found this site for that motherboard: https://www.asrock.com/MB/Intel/B360M%20Pro4/index.asp#Download
The driver should automatically be on their. But you could go to your device manager and make sure your connected to internet and then if you see anything will a yellow explanation point, right click on that and click update. Then just choose find automatically, which is the first option I believe. Or if you want to do it manually, I found this site for that motherboard: https://www.asrock.com/MB/Intel/B360M%20Pro4/index.asp#Download