447 Views 1 Reply Latest reply: Aug 22, 2013 8:50 AM by jeremy_v
Thanks for visiting Apple Support Communities.
This article addresses your question:
iTunes: Purchasing and viewing HD videos
When you purchase an HD video on a supported device or computer, only HD video will be downloaded. To download the SD version, you need to download the video again from your Purchased page. ... Learn more about downloading previous purchases.