If you are upgrading to a paid version of GlassWire 2.0 from GlassWire 1.0, don’t worry. GlassWire 2.0 is a free upgrade for you.
If you run into any activation issues it’s a bug.
Try doing a clean install and if that doesn’t solve it please email us (including your code) so we can help.
More 2.0 tips are here, including details on the clean install option.
https://forum.glasswire.com/t/upgrading-to-glasswire-2-0-tips-tricks-bug-reports-feedback-and-fixes/5576/2