The most common reason MSI App Player fails to start is a conflict between its built-in engine and Windows Hyper-V. Enable Virtualization in BIOS

The most common reason MSI App Player 5.9.300 fails to launch is background software conflicts (anti-virus, RGB controllers, or VPNs).

Deepening the integration with MSI hardware, this version improves the features.

that provides a TV-like UI and refined controller mapping for playing mobile games on larger screens. Common Fixes & Setup Tips