None of my lots at the Hullabaloo are off line because they have embedded hacks and custom content that will mostly likely mess up your game, but you ought to able to download Greg or Sheba, and you should not be seeing a login prompt.
Let's try some direct links right from here:
Download Greg (about 550 K)
Download Sheba (about 250 K)
If you do get a login prompt, note what domain it's coming from so I know where to look for the error. In the box that pops up and prompts you for a login, there will be a little note that says who is asking for the password.
It's always possible that I overlooked a door dragon when I sent them off to the retirement home. I have some domain redirects goin that ought to be sending traffic from old thesims2.
simshost.com to thesims2.
sunsims.com, so the dragon might be hiding somewhere in that path.