Thanks for the information.  Apparently one of the Microsoft Windows automatic updates resolved the issue.  The installation ran for over an hour (and this is a fast desktop).  When I tried to install the Net Frame 4.6.2 again, it replied that Net 4.6.2 was already installed on my computer.  I next ran the update to my flight simulator (Lockheed-Martin P3D) which required Net 4.6.2 and it installed fine, so please close this issue.