This is still an issue. Does someone have an answer meanwhile?

Do I need to add a component for the maintenance tool (that I could declare <ForceUpdate>true<ForceUpdate/>)? That would require a 2-stage installer build, wouldn't it? And how would this component and installer's own dealing with maintenance tool get along with each other?

How do Qt themselves accomplish this? Is there a dedicated built-in way? Certainly the requirement to update maintenance tool first is not an exotic one, as this post's views indicate.