Starting with v. 1.4.1 and higher, OpenStudio uses Ruby v. 2.0. The SketchUp Plug-in is compatible with SketchUp 2014 only.
Join the OpenStudio Developer Mailing List for important announcements about changes to the OpenStudio APIs or build configurations.
The OpenStudio source code repository is moving from SVN to GitHub. We are currently in the process of making this change.