title: Failure adding assembly to the cache: This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded
body: <p>I am having this same problem: 
  <a href="https://stackoverflow.com/questions/24745396/isvisualstudio2012proinstalled-method-not-found-error-when-running-an-ssis-pac">IsVisualStudio2012ProInstalled() method not found error when running an SSIS package from VS2012</a> (I didn't have enough rep to comment and ask for help there). This issue started when I had visual studio 2012 installed but then installed visual studio 2015, the shop I work for uses both. </p>
  
  <p>I followed the instructions of the #1 answer but getting the error below </p>
  
  <p>I've entered this in command prompt: </p>
  
  <pre><code>C:\Program Files (x86)\Microsoft Visual Studio 
  11.0\Common7\IDE\PrivateAssemblies&gt;"C:\Program Files (x86)\Microsoft 
  SDKs\Windows\v7.0A\Bin\gacutil.exe" /if Microsoft.SqlServer.Dts.Design.dll
  </code></pre>
  
  <p>Error:</p>
  
  <blockquote>
    <p>Failure adding assembly to the cache: This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded.</p>
  </blockquote>