Downloaded OSX 10.5.7 as I want to downgrade my iPhone from 4.0b2 to 3.1.3. My other VM was 10.5.? and couldn't get one of the packages to install. Required 10.5.6. So I downloaded this new image and loaded it up and got the following message:
What do I need to do to get this one to work for me?

What do I need to do to get this one to work for me?