After installing the “Creators” update you will lose activation of fonts (I tested this with InDesign).
Previous fixes for major updates suggested uninstalling and reinstalling. You do NOT have to uninstall and reinstall to get it working again.
I was able to run the latest installer, select MODIFY and continue.
I did NOT restart after the modify install. I immediately opened up InDesign. It loaded my fonts perfectly.
I hope this helps someone!