Download the little Tool "Module_Gui-1.0"
http://www.ls-universe.info/download.php?view.35

Extract "ModuleGUI.exe" and "settingsipc.dll" in your Litestep Folder!
(Same folder in which your "litestep.exe" is located)

Then run Module_GUI choose the required modules and download/install all.

Hope this helps :)