Although Windows 7 still controls a noticeable share in the desktop market, many gamers were forced to upgrade just to fully enjoy various DirectX 12 titles. However, the latest update for World of Warcraft: Battle for Azeroth — patch 8.1.5 — is the first title to bring full DirectX 12 support to Microsoft's outdated operating system.
https://www.notebookcheck.net/You-weren-t-expecting-this-Windows-7-gets-DirectX-12-support.413958.0.html