Can't re-download "Fellowship of the Ring" (HD)

Hi everyone,

I previously purchasd the "The Lord of the Rings" special extended edition, and I downloaded the FULL HD version. Today I received a letter from iTunes Team, here's the detail:

Subject: Your Fellowship of the Ring download

From: iTunes Store

Dear iTunes Customer,

Thank you for downloading the movie Fellowship of the Ring. Unfortunately, the movie you received may have had issues with the subtitles. We have corrected the problem and a new copy is available to download, free of charge. To receive the new version, please re-download the title from iTunes.

So I deleted the film, and tried to re-download the corrected one.

Here comes the problem, at the beginning the download window shows that

the size of the FULL HD version of the film is "7.78 GB",

but it suddenly turns out to be "3.50 GB", while keeps downloading.

And even it keeps downloading,

the process will eventually stop just right at 3.50 GB, with an error message behind.

According to iTunes Store description, the size of the FULL HD version of the film should be 7.78 GB, instead of 3.50 GB. Does anyone know what is going on? Thanks!