Drivers are update to date according to Windows.Windows 10 is up to date according to Windows update app (had to use April 18 update as start version since the installation does not work with October 18 version).In fact, when a video is played the green volumen bars in the audio device driver properties move but there is no sound at all. Windows 10 Device Manager app does not show any problems with the drivers such as yellow triangles or red crosses. Run the Boot Camp Windows Support Software and everything is fine, Apple mouse & keyboard, except audio is missing. Easily share files, devices, and other resources between Windows and Mac. Run Windows applications side-by-side with Mac applications. All the Boot Camp benefits PLUS: Run Windows and macOS without restarting. I installed Windows 10 (April 18 update) on external SSD drive that can be selected on the iMac's startup. Install Microsoft Windows 10 on your Mac.