You can download the O2 GUI (and its scripts) from: http://tiny.cc/O2Platform (this is the same you would get if you installed O2 from GitHub)
You can download the C# REPL environment from http://tiny.cc/REPL and read about it at this post: C# REPL Script Environment
Let me know how it goes, and if have issues please use the 'Report Bug' feature from the Help menu (which will send an email to me with your logs)
Thanks