Currently it only supports static meshes, porting over their location/rotation/scale, any other kind of actor or special properties are ignored. If there is enough interest the tool can be expanded to include other actors like Lights, BSP, etc.

Setting up trueSKY on Unreal Engine 4
The installer puts the plugin into the “[UE4]\Engine\Plugins\TrueSkyPlugin” directory in your UE4 installation. After running the installer, you need to run GenerateProjectFiles.bat in order to update the UE4 project to include the trueSKY plugin. CHANGES
There are now two trueSKY modules in the UE4 project – TrueSkyPlugin, and TrueSkyEditorPlugin. This helps with building for standalone cooked projects. Whereas pre..................