In case you forget your license key, you can fill your email address above and click "Forgot your key" to retrieve. The license key will be resent to your mailbox. If you cannot access to your mailbox, please contact email@example.com.
If you want to utilize Surge on another device, you can always switch devices by deactivating one of the devices in Surge Mac preferences window so that the other device can use the slot. Or you can simply reset your license here, deactivate all your devices and regenerate the license key. Reset can only be performed every 30 days.