If your Mac no longer has macOS (you wiped it completely for Windows 10), you cannot use Bootcamp Assistant. In this case, you have two safe alternatives:
If you install Windows 10 on a Mac via Bootcamp Assistant but do have Bootcamp 6.1 (or newer), you will face missing drivers, no Wi-Fi, no sound, and a frustrating experience.
Bootcamp 6.1 _verified_ Download Windows 10 -
If your Mac no longer has macOS (you wiped it completely for Windows 10), you cannot use Bootcamp Assistant. In this case, you have two safe alternatives:
If you install Windows 10 on a Mac via Bootcamp Assistant but do have Bootcamp 6.1 (or newer), you will face missing drivers, no Wi-Fi, no sound, and a frustrating experience. Bootcamp 6.1 Download Windows 10