==Lego-Digital-Designer-v2.3== 
//*
Version 2 of LEGO Digital Designer offers many improvements and great new features, including:

    * Improved building experience
    * Quicker selection of bricks
    * Easier to connect bricks when building
    * New brick palette tool for easy use
    * More Bricks in the palette
    * Partly built models for easy start up
    * New backgrounds for model view
    * Support for the Market Street and the Hobby Train box
    * Improved virtual building guide generator
    * Complete redesign of the interface

*// (from site)

you can just head over to ldd.lego.com/download and probably get it faster-
But here it is~