StyleCop 4.5 (build 4.5.19.0) has been released at http://stylecop.codeplex.com/releases/view/62209
For the last few versions, StyleCop has checked for a new version at the start-up of Visual Studio, so you can more easily keep up with the latest version. StyleCop's integration with Resharper (referred to as R# in the setup) continues to improve. I have recently finished Style-Copping the TimePeriod solution at http://www.codeproject.com/KB/datetime/TimePeriod.aspx
The improved StyleCop / Resharper integration made cleaning up the code much easier. I suggest that you install it and if you are not yet using Resharper, get and install Resharper first.