Can I Redownload A Digital Copy Sims 3 If Needed I Lost My Digital Copy Of Star Trek, Can I Get It Back Without The CD Or Serial?

I lost my digital copy of Star Trek, can I get it back without the CD or serial? - can i redownload a digital copy sims 3 if needed

Some time ago I bought my digital copy of Star Trek on iTunes, and I see buying the story, but I lost the current file of the video. I started the CD and the number after the redemption. Is it possible to re-download movie?