Hi There,
You should be activate the plugin it self on > Wp Admin Dashboard > Plugins.
if once you did that, the plugin is asking you to activate it with a purchase code, you can ignore that message, to validate you need to purchase it, but the non “activated” version of the plugin that comes with X offers all the same features.
The only difference is that you cannot download some of their premium templates and that you also need to load templates manually.
Let us know if you have further questions,
Joao