Going from VS Beta to VS RC or to VS RTM
Some people have asked me and I've also seen this question in the MSDN installation forums (Visual Studio 2010 Install and Setup):
Q: What's the setup experience if I have a pre-release version of VS on my machine and I'd like to upgrade to the newest released version?
Answer: You will need to go through the uninstall of the VS pre-release version and then install the newest VS version. The installation of the newest version will show up a block message on the pre-release version of components that are installed on your system and need to be uninstalled in order to get the newer bits.