Lost Digital Download for TS3 Seasons - still have activation key

When I bought Seasons as a digital download originally through Amazon, it was not working for Mac downloads that day so I bought it from another source.( I wish I could remember -- I want to say Mac Geeks or something. The Amazon customer service rep recommended it.)  I still have my registration code, but I don't have the digital download anymore. It is not on my origin account even though all of my Amazon purchases are on there. Is there any way for me to get a copy of Seasons on my origin account and use my registration from this other site instead of buying a new copy of seasons?