Because Apple does not host old driver versions on a public-facing search page, you need to use one of these methods.
Because Apple removed official links to Bootcamp 6.1.19 after transitioning to Apple Silicon, community archives exist. Search for Bootcamp6.1.19.zip with verified SHA-256: a1b2c3... (Always verify against Apple’s signature; never run unsigned .exe files).
Assuming you have already installed Windows 10/11 via Bootcamp Assistant, you now need to update (or downgrade) to 6.1.19.
Prerequisites:
Procedure:
Control Panel > Programs > Uninstall Apple Software. Reboot, then run the 6.1.19 MSI.Boot Camp 6.1.19 consists of: