Silverlight reached its end-of-support in late 2021. No further security updates or patches are being released by Microsoft.
Silverlight does not work natively on Mac computers with Apple Silicon chips. Where to Find Download Links (Legacy Use Only) download silverlight for mac
However, if you are working with legacy systems or older hardware, here is the current state of Silverlight on Mac. Silverlight reached its end-of-support in late 2021