Removing canceled downloads

I bought both Avengers and Prometheus in HD recently and iTunes also includes the SD versions. While I appreciate the SD version being offered, I really have no use for them and don't want them taking up space on my hard drive. So I stopped these downloads and removed them from the available downloads screen.

Yet now, whenever I try to download something else, these SD movies pop up again and again, I have to cancel and delete them from the menu. Does anyone know if there's a way to tell iTunes that I don't want these versions and to stop trying to download them to my computer? I should note that I did try letting them download completely and then removed them manually from my computer, but once I do that, iTunes tries to download them again.