title: Does vs2015 and 2013 upgrade the .net framework of that machine to a specific version, or have prerequisites?
body: <p>My build server has .net 4.5.1 installed on it (out of support, I know). </p>
  
  <p>If I install visual studio 2015 on it, will it upgrade the framework to a newer version? If so what version? Or, does it have a .net framework prerequisite?</p>
  
  <p>I don't think that 2013 predates 4.5.1, but same question - does vs2013 upgrade to a specific .net version, or have a framework version prerequisite?</p>