The file pointed to in the 0.5.1 Beta 4 email says it is Beta 3
and the post about it isn’t setup permissions-wise
Looks like a small clerical error.
There is no beta 4…yet.
There was, but it was repealed quickly (at least that’s what I thought).
I had attempted to unlist that message as a draft, as Beta 4 was not up yet. It is up now. Sorry for any confusion!