At the time of writing this, Xsd2Code does not install nicely in VS2012. It’s easy enough to “copy” your install from VS2010, though. Here’s a summarized version of adrianot75’s solution.

1. Copy Xsd2Code.Addin.Addin from the VS2010 Addins directory to the VS2012 Addins
   • From: %UserProfile%\My Documents\Visual Studio 2010\Addins
   • To: %UserProfile%\My Documents\Visual Studio 2012\Addins
2. Edit the Addin file to include an extra element for version 11.0

   <HostApplication>
     <Name>Microsoft Visual Studio</Name>
     <Version>11.0</Version>
   </HostApplication>