I got the following response:
So I'm requesting an enhancement to the client install. When upgrading if Vault is currently the default SCC provider, please check that option in the install, because it isn't really clear that not checking it will change your current default if it is already Vault.Those of you using VS.NET, be aware that installing this appears to have changed my default SCC provider back to Source Safe, which caused all kinds of confusion until I realized what happened.
Mike