by Dalai » 11.04.2018, 01:26
It should be downloaded automatically when you run UpdateGenerator (or DownloadUpdates.cmd) again. If you happen to get an update catalog (wsusscn2.cab) that's not dated today, you'll have to try again tomorrow or the day after that. Sometimes it takes a little time for MS to get their servers in sync so they all provide the same files.
Regards
Dalai