Changing old questions/answers is bad. But it is a site-specific issue that software versions come and go and all material linked to them will decay. Would a question of an issue on v6.0.1 that cannot be solved with any solution addressing v5.6.9 and before be closed as duplicate or "too narrow"?

I think there is another way. Questions on superuser can be directed to a specific version of a software, right?

@Ramhound In an ideal world, yes. But very often people "follow the herd" and upvote what is already upvoted. And the gap is too wide

We could get OP to mark the valid answer as accepted, but he is inactive for a long time.