For official support, you can check the Microsoft Screen Mirroring Guide for more details.
Because Miracast relies on your computer's physical hardware (your Wi-Fi card and graphics processor), you cannot simply download an app to add the feature if your system lacks the proper hardware components.
✅ Yes — built into Windows 8.1. ❌ Need to download anything? No — just update drivers if needed. ⚠️ Not working? Your hardware likely doesn’t support Miracast — consider a physical HDMI cable or a Chromecast/AirPlay workaround. miracast download for windows 8.1 free
如果你的老舊電腦經過檢測後，確認硬體無法支援 Miracast，千萬不要氣餒。市面上仍有許多優秀、穩定且「完全免費」的替代方案，可以讓你達到無線投影的目的。
Microsoft MVP experts consistently warn users to be careful when downloading Miracast software from third-party sites, as many advertised products are frequently classified as PUPs. For official support, you can check the Microsoft
Miracast is a wireless technology that allows your Windows 8.1 computer to project its screen to a TV, projector, or streaming media player. Unlike traditional cables, it uses Wi-Fi Direct to establish a secure, direct connection between devices.
Wait for the green progress bar in the lower-left corner to disappear. Click the button at the bottom. ❌ Need to download anything
. On Windows 8.1, it’s built into the DNA of the OS, but it feels like a secret club where your Wi-Fi card and Graphics card must both have an invitation. 🌟 The Good Zero Cables:
Because Miracast is a hardware-dependent protocol integrated directly into the core architecture of Windows 8.1, you cannot simply download software to add the feature if your hardware lacks support. Instead of searching for a download file, you only need to ensure your drivers are updated and follow the native activation steps. System Requirements: Does Your PC Support Miracast?
Wait a few seconds for the green progress bar in the lower-left corner to finish loading.
Windows 8.1 WiDi - will not mirror screen to TV - Microsoft Learn