the method just described did not work still.

how i did it is the download the jar file (1.9 mb file)

unzip in its folder

go in to find the source xml and the folder that is needed
for example
D:\EasyJavaSimulation\EJS_4.3.0_100613\EJS_4.3.0\workspace\export
D:\EasyJavaSimulation\EJS_4.3.0_100613\EJS_4.3.0\workspace\export\ejs_users_sgeducation_lookang_ejs_EarthAndMoon3D_EarthAndMoon3D\users\sgeducation\lookang\ejs_EarthAndMoon3D
need
EarthAndMoon3D.xml and folder TEXTURES
copy these into the usual source user ... / ...
D:\EasyJavaSimulation\EJS_4.3.0_100613\EJS_4.3.0\workspace\source\users\sgeducation\lookang\ejs_EarthAndMoon3D

it should work now