The CF7 Skins plugin is freely available to all WordPress users from the WordPress Plugin Directory.
The CF7 Skins Pro plugin, as a premium plugin, requires purchase of a unique License Key from cf7skins.com.
Purchase of a license for CF7 Skins Pro entitles users to any updates of the plugin and email based support for the duration of the licensing period.
Both CF7 Skins and CF7 Skins Pro are distributed under the GNU license meaning you are free to use all the liberities of that license.
The Licenses tab is where you will enter your license keys. Adding a license key and activating it is fairly straight forward.
First you will log in to cf7kins.com Account. There you will see a link to your downloads and licenses. Simply copy your license key and paste it on the Licenses page.
First you need to save your license key by clicking on the save changes button and then click on the Activate License button.