Dear Daniel,
Thank you for contacting iTunes Store Support. My name is Gracie, and I am glad to assist you with your concern today.
I understand that your unable to download your purchased movie “Anchorman: The Legend of Ron Burgundy” from the iTunes Store with account xxxxxxx. I know how upsetting that can be. Let’s see what we can do for you today.
Daniel, if you don’t see what you want to download in the list, it may have been removed or modified since you purchased it, and no longer available for download. Thus, to confirm I’ve checked this movie on iTunes store and verified that it [this movie] is no longer available on iTunes store.
In addition, I know your files are valuable to you. As such, I encourage you to back up your purchases regularly as Apple does not offer protection for the loss of data. If at any time, your items need to be replaced, you can restore your purchases and other data from the backup and avoid the need to purchase replacement copies of your collection. iTunes makes the backup process simple, as explained in these articles: