Premiere Elements 2018 Trial installs but won't start

I downloaded and installed Premiere Elements 2018 Trial version without any errors.  When I try to start Premiere, I get the "Sign In Required" window. When I enter my Adobe ID and password and the hit the Sign In button, the window goes to another window titled "Adobe Premiere Elements 2018". That window says "Please wait for a moment..." and there is a spinning indicator showing that it must be doing something to try to authenticate my user ID. At that point it will continue to spin forever. I have left it spinning for hours and nothing happens. No errors, no indication that the ID is bad. I've tried this from the the Organizer (which works OK) and directly from the startup windows that gives you the choice of starting the Photo Editor, the Organizer, or the Video Editor and I get the same result.

I also have Adobe Premiere Pro CC 2017, Adobe Photoshop CC 2017,and Lightroom CC on the same computer.  Those all work fine. I use to run Premiere Elements 11 on this same machine a few years back, but uninstalled it when I moved up to Premiere Pro CC.

I'm on Windows 10. Intel Core i7 920 @ 2.67Ghz. 8 GB ram. I have plenty of disc space.

Any help would be appreciated. Thanks.