Install the driver…
Merging Technologies repository of current software and documentation.
www.merging.com
To expand on this answer, Ravenna is an ASIO driver for Windows, and Windows can not directly output sound to ASIO devices. You will need playback software capable of sending audio to ASIO. Fortunately, nearly all playback software on Windows supports ASIO output.
However, this also means that you can not send sound from a web browser to your system (for example, if you want to watch a Youtube video). In this case, you will need software that converts WDM to ASIO. JRiver can do it.
I have only skimmed this thread and do not know if anybody has mentioned latency. Latency is not a problem with music, but it is a problem with video because it causes lip sync issues. I have something like 1 second (!!!) latency on my system, which means you see the explosion and hear it a short while later. This can be circumvented by not using FIR filters and sacrificing some time alignment and sound quality, but I have not bothered because I hardly use my system for watching TV. There are people on ASR who are much better at developing low latency filters than me, so I will defer to them.