This is the 2.0.3 upgrade of the SubSonic Tools for Visual Studio.
The setup program will install the SubSonic Add-in for Visual Studio as well as the source code for SubSonic, the Add-in, the Custom Tool and the Macros.
I have been told that the MSI may not work on Vista. Try running it as an Administrator. If that doesn't work, it may be better to dowload the latest sources and compile/deploy the tools yourself if you use Vista.