Corrupt/incomplete torrent? Wrong download/checksum? Is the download an .iso file? Can't be anything else, really.
'Sir, please,' she said... 'Will you not share your wisdom with us?'
'I have no wisdom,' he told her.
'Your experiences, then?'
'They have been trivial, uninteresting, and full of error.'
Ian M. Banks - Feersum Endjinn