To get the Boot Camp Support Software 6.0.6133 or the latest Windows 10 drivers for your Mac, Apple recommends using the built-in Boot Camp Assistant
https://support.apple.com/downloads/bootcampWindows 10 and look for Bootcamp 6.0.6133.If sound is missing after the 6.0.6133 install, check the Device Manager. You may need to manually update the "High Definition Audio Controller" by pointing it to the "Drivers" folder within the Boot Camp package. 2021 Update: Compatibility with M1/M2/M3 Macs Bootcamp Drivers Windows 10 64 Bit 6.0.6133 Download 2021
Open (found in /Applications/Utilities/ ). To get the Boot Camp Support Software 6