Windows Defender Advanced Threat Protection coming to Windows 7 and 8.1
A Windows 10 feature is coming to old platforms.
Peter Bright - Feb 12, 2018 5:19 pm UTC
Coming this summer, the Endpoint Data and Response (EDR) portions of ATP will be available for these older operating systems, allowing their health and status to be managed through the cloud interface. This will be paired with either third-party antivirus for endpoint protection or Windows Defender/System Center Endpoint Protection.
Read the detailed informtion here: