title: NuGet Package Manager errors when trying to update
body: <p>Opening VS2010 today, the extension manager notified me of an update for NuGet Package Manager.</p>
  
  <p>During the install, I get an 'Installation Failed' with an option to view the log.</p>
  
  <p>The key error message I see in that log file is:</p>
  
  <pre><code>The signature on the update version of 'NuGet Package Manager' does not match 
  the signature on the installed version. Therefore, Extension Manager cannot 
  install the update.
  </code></pre>
  
  <p>The version numbers I am upgrading from/to are as follows.</p>
  
  <pre><code>Current Version: 1.5.20902.9026  
  New Version: 1.6.21205.9031
  </code></pre>
  
  <p>I have also tried to install it while VS2010 is closed via this page:
  <a href="http://visualstudiogallery.msdn.microsoft.com/27077b70-9dad-4c64-adcf-c7cf6bc9970c">here</a></p>