I've purchased about 100 movies on iTunes over the years, and I am now trying to figure out how to delete those old 720p movie purchases and re-download the 1080p version. I've tried and failed doing so with a half dozen movies so far. I know that not all movies on the iTunes Store support re-downloading the upgraded version of the movie because not all movies studios have signed-off on 'movies in the cloud', and that might be my problem. Let's take the movie 'The Incredibles' as an example... A year or two ago, I purchased this movie on the iTunes store (it's a 'Protected MPEG-4 video file') and the version on my computer is 1.6GB (853x354 res). Obviously a lower than HD version. The 1080p version is offered for sale on the iTunes store and it says that it's a 3.25GB file. So I delete the non-HD legacy download off my machine, then visit the 'Purchased Movies' section of the iTunes store, and try re-downloading the updated file, and it simply starts downloading a 1.6GB version of the movie, not the HD copy. I've made sure my iTunes' Preferences are configured so 'When downloading High-Definition videos, prefer 1080p" is set, but it's still downloading the smaller version of the movie. Any suggestions would be greatly appreciated... Thanks!