You're probably trying to download a fake file. Check the file before download with Bitzi, if the file has heaps of sources but no Bitzi rating then chances are it's a fake. You'll find a link to info about Bitzi within this thread.
Fake files showing up in search results

Because the movie's so new (still in cinemas here), you might have to search for a while before you find a reasonable cam version You possible won't find a good version until it's released on DVD.