Upgrading to Pro version

How the bloody hell do you upgrade? I have purchased the pro plugin but installation tells me the plugin already exists… yet there’s no place where it will allow me to enter the license information. What a pain… Your documentation is missing instructions on this: https://www.themehigh.com/doc/general-guides/license-key-activation/

Am I supposed to delete this free version first? I guess I will try that – what a waste of my time… not impressed that this first set of steps is not obvious.