Morroblivion

Okay, I downloaded Morroblivion and as soon as it was done it said "Error, the archive is either in unknown format or damaged" what should I do? I'm sad that I didn't get as far as the other people that downloaded this :( Also, I read some of the other people's issues and if I missed something that I should have done, please tell me instead of being a little insulting. Ignorant people annoy me too though, so I understand :P