GlassWire has no ability to uninstall itself and I have never seen this reported before.
You should go to add/remove programs and make sure GlassWire is really uninstalled. If it is not please uninstall it.
Now reboot, then reinstall GlassWire from our file at www.glasswire.com by pressing the “download” button there.
Your code should work as usual without having to do anything if you did not deactivate (even if GlassWire was uninstalled). If you were somehow deactivated find your order email and go to our top left menu and choose “activate” then paste in your code.
Our license system is intelligent and usually has no issues but if you do run into a license issue please email me so I can help. https://www.glasswire.com/contact/
If you use any “cleaning” software, please white list GlassWire so it will not be uninstalled or deleted again. You can also white list the programdata/glasswire folder to avoid your license being deleted.