Download an executable from a p2p network and run it? Are you freaking mad?! I'm sorry, but I like not having viruses, trojans, or spyware on my system a little too much to do something like that.

And I've been told that you can NOT go back to 4.8.1 from the betas without losing your incomplete downloads.

Well, can you or can't you? Now I've gotten two contradictory claims.