The desktop app updates itself over the network. It checks a manifest on the release server, pulls the build peer to peer over Hyperdrive from other nodes, verifies the sha256 against the manifest, and asks you before installing. If the swarm cannot be reached it falls back to a direct download. This page is the human-readable log of what each release carried.
Installed apps hear about a release from the manifest and pull it from the swarm. This page is for the people who like to read before they click.