I got mine on the 21st but didn't download it until yesterday. It installed over the beta without a problem and upgraded the beta library.
The link Adobe give you in the email is for one time use only. Also note that there is a link to the the RSP sidecar migration tool in the email and this should start working on the 5th March.
I must confess LR has come on considerably since the beta, I loaded 1500 images into the library in 5 mins on a USB caddy drive and no crashes yet.
The spot dust removal is a little strange at first, but once you realise how it works together with the sync feature, you can mask persistent dust spots across hundreds of images at the click of button. Great feature!