To enable Lua integration in UE4, follow these steps: 1. Download Lua source code, unzip it and copy the entire lua-5.3.0 folder to Engine/Plugins/ScriptPlugin/Source/Lua/ 2. Open Engine/Plugins/ScriptPlugin/Source/Lua/Lua.sln in Visual Studio 3. Build Release Win32 and Release x64 configurations. 4. Regenerate project files with GenerateProjectFiles.bat 5. Open UE4.sln and rebuild your game target (and the editor/engine)