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#30
Only the Patch Tuesday updates will automatically be downloaded by windows update. For all the other CUs, like this one, windows update will not find them unless you specifically click the 'Check for updates' button. So only one of those updates was 'mandatory'. The others are for you to choose to install (or not).
The reason is that only the CU for second Tuesday of the month contains any new security fixes, all the others are previews of quality updates that will be in the next 'Patch Tuesday' update.
Windows 10 update servicing cadence - Windows 10 ForumsMicrosoft said: