Hey, I had the same issue. Modifying the relevant assembly definition files before building seemed to work. For me those files were: plug-ins/Apple.Core/Apple.Core_Unity/Assets/Apple.Core/Runtime/Apple.Core.asmdef plug-ins/Apple.GameKit/Apple.GameKit_Unity/Assets/Apple.GameKit/Source/Apple.GameKit.asmdef Modify them so that they're constrained to not build if Unity Editor on Windows is defined. "defineConstraints": [ "!UNITY_EDITOR_WIN" ] Then build the 'Apple Unity Plug-Ins' package as normal after.