Requested since MCMS 2002 SP2 has been released was a possiblity to install MCMS 2002 with VS.NET 2005 without a need to install VS.NET 2003 first.
As SP2 is a service pack that only updates installed components it was necessary to install VS.NET 2003 first to ensure that the MCMS development tools could be installed with MCMS. Only this allowed the Service Pack to upgrade the developer tools to support VS.NET 2005.
For customers who did not want to do any VS.NET 2003 development or even did not have a copy of VS.NET 2003 this caused problems.
Microsoft has now released a hotfix (actually it is just a vbs script) that modifies the system in a way that allows the SP1a installer to install the developer tools for VS.NET 2003 without having VS.NET 2003 installed before. The developer tools can now be upgraded by the SP2 installer to be compatible with VS.NET 2005 as well.
The fix has been released as KB 915190.