title: How to upgrade nuget packages if the installed version is missing?
body: <p>Running into a situation where I deployed an application to production a few months ago and now I need to do some work on it, on an entirely new machine. The first I do is pull source and nuget restore won't restore because it can't find the particular version of the package it was developed under. When I check nuget.org for this package version it is not there. So how do I upgrade my solution to the latest binaries? </p>
  
  <p>Visual Studio 2013 trying to update ServiceStack '4.0.39' to latest, which is '4.0.40' at the time of this post.</p>
  
  <p>Thank you,
  Stephen</p>