We have investigated your issue, and it appears that you accidentally opened a second instance of Miqobot while the first one was still running.
Running two instances of Miqobot is known as Multibox solution.
When you open a second instance, it goes into trial mode automatically to avoid re-using your License Code. But since you enforced the usage of your License Code on second instance, the first instance was disabled and you saw the message “Someone else has used your license code.”
You can find more information about it here: Multibox Support.