When you download a Notion template, you're making a copy in your workspace. This means any new updates won't be automatically added to your version.
For minor updates, a brief Loom video is often recorded to guide users through implementing the changes to their existing template.
For significant updates, a new template link is provided. Users can duplicate this new template and transfer their existing database pages to it.
An example of the migration process is shown in this Loom video.