Here are the steps to add Domain to your license.
- Log into my account and select " My Downloadable Products".
- Located your purched extension and enter your domain address including the protocol, example: https://www.extendware.com
- Click on the UPDATE button to generate my licens code.
- Mark the license code and copy it ot your clip board.
- Access your Magento backend and access Stores > Settings > Configuration > Extendware Extension > General Settings
- Paste your license code and apply it.