Hi Tony,
The instructions on the CodePlex article are slightly incorrect, the "Mercurial" link doesn't exist. The correct link you need to click on is "Connection Instructions" which will just then popup a little box with the URL for the repository.
Once you have that URL (https://hg01.codeplex.com/mojoportal), use it to clone the repository to your machine.
You have 2.3.6.0 because that is the latest version in the repository, which is 99% of the time a little bit ahead of the official stable release.
HTH,
Joe D.