This executable is located within the engine’s directory at Engine\Extras\Redist\en-us\UEPrereqSetup_x64.exe . It bundle-installs several key dependencies:
Do not rely on the user to run the setup manually. Write a small bootstrapper that detects missing DLLs and triggers UE4PrereqSetup_x64.exe /quiet . ue4 prerequisites x64 setup exclusive
The "UE4 Prerequisites X64 Setup" is a dependency installer packaged with games and applications built using Unreal Engine 4. This executable is located within the engine’s directory