Hi there, did you make sure the download was completed successfully? I think the download was incomplete, and thus displaying such an error message.
I believe so. I have downloaded it a couple times now,(deleting it each time before downloading it again) one of witch I sat and watched the download myself. Yet, every time I get the same message. Also, I am not sure if it is important but each time I have downloaded it it claimed it would take several hours to download but it finishes in under 10 minutes.