All of my DACs that I use regularly are USB Audio Class 2.0, but they are too new to have drivers from the manufacturer. A universal driver was added at some point in Windows 10’s lifespan, and this driver seemingly cannot be backported. I use both XP and 7 regularly, so I’d love to have a driver for one or both of these OSes. I have tried paid solutions (trials) like Thesycon or XMOS, to no avail. Someone had shared a modded Realtek driver on this site, which does not work for any of my hardware on Win7/8.1 x64.