Update your drivers to the latest version. For NVIDIA users, certain hotfixes (like the 430.97 hotfix) have historically resolved this specific SM4 error. 2. Verify Game Files (Steam)

You should standalone .bin files from third-party websites. These files are hardware-specific and project-specific; a cache file from one user's computer likely will not work on yours and could contain malware . Instead, use the following methods to regenerate the file correctly. Recommended Fixes Global Shader Cache is missing. UE4.3 - Platform & Builds

(UE). This specific file is used to store pre-compiled shaders for DirectX 10 / Shader Model 4 (SM4) compatibility. Unreal Engine

Fast activation • Secure service