I have stopped trying to run down error codes with individual updates, although I will often allow a cumulative update to attempt to update at least twice, as the occasional "burp with code," while not common, is far from unheard of and often resolves itself on the second try. But if it doesn't, then I move along to the previously noted techniques. If you do a Repair Install/Feature Update with the ISO, it is entirely up to you whether you have updates from after the ISO was built fetched as part of that process or not. If you decline, Windows Update will fetch them afterward.