App is available from Atlassian Marketplace
Once installed, you can access it from Apps -> Advanced Export menu at the top.
From 2.x to 3.x (version released 13th May 2023: scheduled exports, dashboard)
If you are upgrading from a previous version, click the "Update button" in the Manage apps screen.
You'll be asked to confirm the upgrade and approve the "Act on JIRA user's behalf" capability. The app needs this capability to be able to schedule exports on your behalf (See Scheduled exports for more details)