As of Hook 2.0, Hook app release notes are available here (this is not a master index, however).
- Hook 3.0 Release Notes and download link
- Hook 2.2.2 (4009) Release Notes,
- Hook 2.2.1 release notes,
- Hook 2.2 release notes are available here,
- Hook 2.0.x release notes.
In the Release Notes category of the Hook Productivity Forum, you will also find
- Hook App release notes (previous and current), and
- Hook’s integration script release notes. This lists updates to how Hook interacts with your favorite apps.
The forum affords the opportunity to discuss releases.
If needed, consult Reverting to Prior Versions of Hook – Hook.