Macos-sierra-10.12.6-french.iso -

to run a French macOS environment on a Windows or newer Mac host. Legacy Support:

You can sometimes find the InstallMacOSX.dmg for older versions on Apple’s support site, but Sierra specifically is no longer listed publicly. macos-sierra-10.12.6-french.iso

ISO (standardized disk image compatible with virtual machines and bootable USB creation). Major Features Introduced in Sierra: Siri on Mac: to run a French macOS environment on a