Brought from retailer but without CD rom to install

Hi,

 

I brought the norton antivirus 2011 from a retailer, the guy there told me that I dont need a CD/dvd drive to install, that I could download straight from the web site and then enter the serial number to register.

 

But I cant find where that I can download without paying again, cause the download links bridge me to payment screen......

 

Anyone can help?

 

Thanks