There was a server compromise a few weeks ago. A migration to a new server is happening, but slowly. Joel, who has had very little time to give to Eraser for more than a year now, will restore the links to the beta builds when he can. I understand that all the material that was on the compromised server has to be checked.
At least 6.0.8 is downloadable. That means that, if the server compromise was in any way motivated by a desire to limit the use of Eraser, it has not succeeded.