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.