There are 2 places where you can deactivate your License Key on your currently installed computer.
1. From Vidicious Software Interface:
On top of your Vidicious software click License and click Deactivate.
On the pop-up click Confirm to deactivate your license from this computer.
2. On your EXPLAINDIO Membership Page:
Login to your EXPLAINDIO Membership Account in this URL: https://account.explaindio.com or by clicking here. On your Dashboard click on Licenses. And, you will find your License Code (License Key) by the application name.
Next to the License Keys you will see your current activations which would give you an option to disable if you have any current activation. Click disable and your current activation will be disabled. As a result the software will be deactivated on your current computer.