title: Visual Studio 2015 reinstall a package
body: <p>after installing VS2015 update 1 RC, i can no more load C# project. Error is:</p>
  
  <pre><code>CreateInstance failed for package [CSharpPackage]
  
  Could not load file or assembly 'Microsoft.VisualStudio.LanguageServices.CSharp, Version=1.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
  </code></pre>
  
  <p>I tryed a repair operation without success, i tryed the clearcache options without success.</p>
  
  <p>Any idea how to manually delete/reinstall this package ?</p>