Collections Management Service Pack R2.1 is now live and ready for download:
First, read through the release notes PDF to view directions and changes list. This new install features an MSI installer to stream line the setup process. After downloading the above service pack, you can install it by clicking on Setup.msi:
The installer will look at your system and suggest an instance of GP to install to:
Select and click through the install windows, and you should be set to go!
You can view a full list of the new features at this blog post.