Here is the link to the rex forum post about overdrive....
http://realenvironmentxtreme.com/forum/ ... ic=10463.0As you will see, you have to register to be able to see and click the download links. Only takes a minute to do that. Download is 3.52GB (ish).
EDIT::
Oh, you need to put your REX order number in you signature also, but its all explained over at REX Forums. And you may well need to update your REX
before installing Overdrive. When I did this, I lost the 'saved themes' I had made

but now i've got nice new everything to make some more.