Add something prominent about the importance of taking a backup first!
Add something about how, if the update fails, a launcher rebuild at the CLI is the next step. At least a note that updates do sometimes fail and that will put the forum offline.
Ideally, a way to signal that the pending changes include something major, such as the database version upgrade which happened recently and which was, last time it happened, really rather a major event, in terms of the number of topics started here for support. As I recall.