The most current code is now on Github, with the Codeplex version being depreciated. You can read all about the planned updates from Mike Shepard.
The Future of SQLPSX
https://powershellstation.com/2016/07/13/the-future-of-sqlpsx/
SQLPSX Update
https://powershellstation.com/2016/07/31/sqlpsx-update/
