How can I transfer the license of Tag Groups (premium plans) to another website?

This is the procedure:

Please log in to your user account, go to Licenses and deactivate the license.

Then install the plugin file (which you can also download from your account) on your new website, activate it with the same user account (email address) and use the same license key that you just deactivated before.

When you deactivate the plugin, make sure that you don’t cancel the subscription.