WPBakery Page Builder asking for License key.

Hi,

It is because if you want to have the update automatically, you need the key for your own, and you have to by that key.
In fact, when you purchased our theme on Themeforest, you do not need to add any license keys, you still get the latest features of theme.
If there is any updating, we will update on theme, and you can wait for the latest version then update for your site.

So, you can ignore the message. When it has the updates, we will update for demo site and you can update later.
Regards,
Yame