When any titles in your account are updated, you should receive a pop-up alerting you that there is a new version of the title available and asking you if you would like to update. If you are not ready to download the updates, no worries. The titles will show an 'Update Available' banner to let you know you still need to update to the newest version.
Here are the steps to manually download a update:
- Tap on the title that has an "Update available" banner.
- Tap the first Table of Contents chapter to close and then scroll to the top of the screen.
- There should be a blue "Update" button which you can tap to download your content updates.