O_o it used to work.. that's where I got it from?! o_O
I know that there were DNS issues, that's what I thought caused the broken link..
If you download the DL DVD, the Upgrade script is on it. it's bootable, and if it senses a previous install, it *should* ask you if you want to upgrade...
now, that said, it *DID* ask me, but didn't work.
My best recommendation is to make sure you have a good backup.