external lightmapping tool

hi, can anyone tell me how to get the external lightmapping tool pluging for 3ds? i have downloaded the file from here http://unity3d.com/support/resources/unity-extensions/external-lightmapping-tool when i run it, it add a package "lightmappin tool" in my project window. im using unity 3.3. thx

Same problem I’m facing…any solution to get a “External Lightmap tool” Plugin in Unity under windows menu???

Pls. suggest…