Sketchup 2018 worked perfectly before updating OS to High Sierra

I was literally working in Sketchup 2018 minutes before updating to High Sierra. After the update, Sketchup is telling me my “license is expired”. I can’t find any record of a license anywhere.

I wasn’t working on a pirated version…I have always just downloaded and updated as suggested via Sketchup from my original Free version.

Can anybody help? Any ideas/input/experience with this?

You should have the e-mail with your license info, still. If you can’t find it, contact SketchUp Customer Support and they should be able to get it for you.