This feature is only available in the Pro version of Independent Analytics.
If you activated Independent Analytics Pro on a website and you no longer have access to it, the license can be deactivated remotely.
To deactivate the license, start by logging into your account here: Login to account
Once logged in, you’ll find yourself in the Websites menu. From here, click on the website where you want to deactivate the license key. A menu will appear on the right side of the screen where you can click the red Deactivate link to disable the license key.

The site will continue running the Pro plugin but will revert to the features available in the free version. You can then use the license on another domain instead.