I misunderstood your original post, sorry. So as you are two actual versions behind (wow) the local update is not possible. It is a recent addition to the updater.
I’m not sure how to advise in this case. Upgrading from iode 2 to 3 may have required some particular steps, I don’t know. Depends what the final stock android version for the S9 was maybe.
EDIT, more info: Search of the forum with keywords upgrade S9 brings up some relevant topics/posts.
In particular see this one: