The steps shown below should help
When you migrate a site, the license key and validity stored in the database will come with it. However, the license will not actually be associated with the new domain! To resolve this, follow these steps:
1) From WP Admin, go to Oxygen > Editor Enhancer.
2) Click "Clear License" next to your license key input field. This will forcibly remove the key and associations on your new domain.
3) Re-enter your license key and activate the license.
Your license should now be attributed to your new domain and Editor Enhancer should work again. To verify, you can visit your Editor Enhancer "My Account" page, go to Purchase History, click "Manage Sites," and see your domains there.