If you’ve installed Windows on a Mac, either as your primary operating system or as a Bootcamp partition, you’ll need some help to get everything running. Apple allows you to download all the drivers from their Bootcamp assistant. However if you have no access to a Mac, that might prove to be difficult. Luckily we have an app called Brigadier that does the trick.
There is a known issue on 2017 iMacs keeping it from installing an audio driver. In order to fix it, use Brigadier to download all the required drivers. Go to: Windows Support -> $WinPEDriver$ -> Cirrus. Find the file named “cs4208_38” right click and select install.