Installing SOA to multiple computers ?Follow

I have played FFXI since US release (2003) and still have the original disks and all the xpacs. Mostly play on my desktop but sometimes on my laptop. I recently tried to use my laptop and couldn't find a way to install SOA without paying for it again. I Have it on my desktop and because my main is parked in Adoulin the laptop was useless. I don't remember the key for the download from digital river. So how can I download SOA to my laptop ? And yes I checked SE account management and everything is legit activated and registered