I was not sure if what I had on my machine was RC or RC2. So here are the details of the two:
ASP.NET MVC 3 RC 2 – Released just about a month later (10th of December 2010), gets installed with the version number of . Here’s the announcement from ‘The Gu’. You can just download and install the RC2 bits directly. There’s no need to uninstall the previous RC version.
So there you go, RC is 11029 and RC2 is 11209 (I actually did get these number messed up!). The other difference is in the size of the installation that gets shown in the Add/Remove Programs window.