Based upon customer feedback, we made a change to the installation program to allow the Web Client Software Factory - February 2008 Release to be installed without requiring you to uninstall the Web Client Guidance Automation - October 2007. If you want to run both guidance packages side-by-side, you will need to uninstall the your version of the February 2008 factory and download the current version of the factory from the download center.
The support for this scenario is the only change in the msi. The source code and documentation has not changed from what was released on February 28, 2008.
As an fyi, as I mentioned in my blog, we are close to finishing the bundles for both Visual Studio 2008 / .NET 3.5 and Visual Studio 2005 / .NET 2.0. Once these bundles are complete, you will be able to download them from the download center. I will send out another blog once they are live.