This is the project home page:
http://code.google.com/p/prs-plus/
For software documentation and installation go here:
http://code.google.com/p/prs-plus/w/list
I would recommend the main thread for prs+ if you want to discuss issues with the software or if you want to support the team. The project pages hold the information in more compressed form while the main thread here grew really big since it got started. So there's really a lot to read.