You do not need to download Miracast for Windows 8.1 because it is a built-in feature. There is no standalone "app" or installer required; if your hardware supports it, the software is already included in your operating system. 1. Verify Compatibility
Miracast is built into Windows 8.1 only if your PC’s Wi‑Fi adapter and graphics driver support “Wi‑Fi Direct” and Miracast; there’s no separate official “Miracast download” for Windows 8.1. To use Miracast (screen casting) and get the best experience, follow these steps: miracast download for windows 8.1 free
Using apps like "Plex" or "Windows Media Player" (built into Windows 8.1), you can stream videos, music, and photos to smart TVs using DLNA. This does not mirror your desktop, but it streams media for free. You do not need to download Miracast for Windows 8
Update Drivers: If the option is missing, use Windows Update to ensure your graphics and Wi-Fi drivers are current. Verify Compatibility Miracast is built into Windows 8