REX Purchase

Hi there,
I've decided to purchase REX for FSX but the procedure seems to be a bit complicated. Can someone guide me thr this.
I want a download+DVD pack of REX with the overdrive option.

1. The website doesn't give me an option to do that. It only says REXv2 download+DVD option. No mention of the overdrive.
2. If I go to the overdrive page on their forums, it says a charge of $10 is applicable. But the home page says textures are free for REX users. Strange.

Please help me on this if anyone has taken this option.

Cheers