title: How can I install Office Interop Assemblies for VS2015 after a Win 10 clean install?
body: <p>I have a Win10 clean install with VS2015 installed. I have Office 2010 for Home and Student. My VB.NET app's msi file was built in 2011 on a machine with Office 2000 installed, and it still works now to install my app in Win10. The installed app exports data to Excel and that still works.</p>
  
  <p>Now I want to update the app with VS2015, but I get build errors, e.g.: Type 'Excel.Workbook' is not defined. I found out that I should load the Office Interop Assemblies.</p>
  
  <p>I downloaded and ran o2010pia.msi, but nothing showed up in "C:\Program Files (x86)\Microsoft Visual Studio 14.0\Visual Studio Tools for Office" where I think they should live. Possibly the installation code is not yet recognizing VS2015 as Visual Studio 14.0?</p>
  
  <p>In searching for answers, I found references to "PIAs in the GAC" and "reference a local copy of the PIAs in your source control tree". But I don't know what these mean!</p>
  
  <p>How can I fix this?</p>