The application is installed and licensed by default via the Atlassian Marketplace as any other third-party app in the Atlassian ecosystem. You can also install it from the Jira administration - Find apps section if you have System Administrator access.
If your license has expired or is invalid, you may see the following screen :
Invalid License Warning, with explanation
Evaluation license limitations
While exporting with an evaluation license, some data will be hidden due to information security.
When the App is purchased for Server platform, the export function continues to work even after the support period ends.