Why Has SketchUp 2017 Trial Version Expired?

I’ve downloaded the trial version of SketchUp 2017 two weeks ago and it has expired unexpectedly. I was just using it yesterday with “14 days left of trial”, and today it’s gone. What happened and how do I fix it?

Did you have it installed previously?

I had SketchUp Make 2016 installed. It advised me of the new version of Sketchup Pro so I tried it. I used the trial of SketchUp 2016 prior to that…

you can fix it here.