Movie won't sync to phone nor computer?

I recently bought the movie Frozen on iTunes, but it won't play!

I downloaded while I didn't have wi-fi available, only cellular data. After I purchased the movie, I remember it saying something about connecting to wi-fi though I am not exactly sure.

Anyways, now that I am home I have been having issues with getting the movie onto anything. It's not on my phone, and when I try to manually put it on my phone through my computer, it says it won't because it needs to be downloaded onto iCloud, however when I attempt to download the movie onto my computer, my computer apparently doesn't meet the requirements for HD, which I purchased, and is telling me to buy SD at full price if I want to download the movie onto my computer, or even watch it on iTunes. I am not willing to pay again for a movie I have already bought, even though I cannot view it.

I'm sorry if I put this in the wrong category, but I am understandably fustrated since while the few songs I purchased are working and have downloaded beautifully, this movie isn't, and I was only able to purchase it through a gift card I got for my birthday. Not being able to see the birthday present I got with it is somewhat disappointing.

I have an iPhone 5c and use an old Windows XP laptop that can play 720p videos just fine...

Thank you for taking your time to read this.