How do I know that an update was really installed?

From version 1.9.19 the first time BookyAI opens on a new version, "What's new" opens by itself with the line "Updated to 1.9.20. You were on 1.9.19." and the notes of what changed. The version at the bottom left of the sidebar shows the version running now. If you install an update over an older version by hand, the same confirmation appears at the next start.