Reset of plugin license for domain change
If you need to deactivate your license because you must change the domain or want to move the license key from your development site to the production one, you have two options to do that.
1. Reset from WP dashboard
From YITH > License activation, you can click on the "Trash" icon that you find by hovering over the plugin name.
2. Reset from My account page
In case you cannot access to your old installation, you can deactivate them from your reserved area. Go to https://yithemes.com/my-account/recent-downloads/ and click on the "Deactivate" button.
Now, you can activate the license key on any new domain as explained here.