If you look here it seems that the latest download was added on 12 April and the change version (4.0.10827.Final) is not consistent with the version from the list (4.0.10818).
However, it doesn't look like it's still being developed. Maybe the current release is deemed to be finished (hence the word Final).
This link for Microsoft Unity 2.1 seems to suggest that you need Moq 4.0, which is quite encouraging!
