I've just sent you TestFlight invitations to install recovery versions that will replace GoodNotes 3 on your device. Please install the version (free or paid) that you were using. If you are not sure, just install both of them. Then please open the app and it will extract the data to iTunes File Sharing. Then please follow the on-screen instructions or [this guide](https://goodnotes.zendesk.com/hc/en-us/articles/201561919-I-am-not-able-to-migrate-my-GoodNotes-3-documents-to-GoodNotes-4-) to migrate your data to GoodNotes 4. If you don't have GoodNotes 4, you can also send us your GoodNotes 3 data for recovery if they don't contain sensitive information.