title: Detect that VSTO tools are installed in Visual Studio?
body: <p>How do I detect that Microsoft Office Developer tools are installed in VS?</p>
  
  <p>NOT the VSTO-runtime, but the <strong>package in the Microsoft Visual Studio</strong>.</p>
  
  <p>For example: user can exclude them on Visual Studio installation.
  detecting Visual Studio Professional is also not an option - for example, in community edition (detected as PRO) there is no VSTO included.</p>