In star wars the force unleashed ultimate sith edition, how to get light side ending?

I completed the game, but only dark side ending, how can i do light side ending? And for ps3 will add-ons for Star wars the force unleashed ULTIMATE SITH EDITION work from playstation network?In star wars the force unleashed ultimate sith edition, how to get light side ending?Not sure about the Ultimate Sith Edition but if you're going for the Light side ending and the Redemption trophy instead of jumping down to fight Vader run towards the Emperor and kick his face in.