You are probably facing some issues while activating the license by getting various types of errors or notices.
This is because Envato is working with the API right now so while activating the license you are facing these issues.
So we would suggest you wait for 20 mins once you face the issue then try again.
Keep doing this until the license is activated.
This is how the license can be activated right now as we are using the Envato API to activate the license now.