In the unlikely event that you need to deactivate your licence key, this is how to do it.
Open the Administrator Tools. this requires Administrator Rights.
This opens a window with one or more licences.
Click on the licence you want to deactivate and then on Deactivate Licence.
Should you need the licence key, later on, you may want to copy it to a safe place. Click here to find out how to retrieve the activation key.