http://au.lexusownersclub.com/forums/index.php?showtopic=8170&st=60
Everything u need for free software and maybe try finding the installation on youtube for your model.
Just sign up. If u don't have Rapidshare account, Free user will still do the job but it will take awhile longer as its 3.17 gigs. Well worth it saving yourself $300
Good Luck.