As noted earlier, optional updates released in the "C" and "D" weeks are not installed automatically. In addition, as of version 1903, feature updates are also not installed automatically unless the current device is approaching its end-of-support date. Using options on the Windows Update page in Settings, you can specify Active Hours (a block of up to 18 continuous hours) when you don't want to be interrupted by these installations. In theory, that prevents a large update from interfering with your workday activities, although the strategy fails if you shut your device down at the end of the day and don't restart until the next day. Windows 10 offers additional notification options as well as the option to choose a specific time (during your lunch break, for example) when updates will be installed.
In May this year, Microsoft came through with its promised convenience rollup of updates and fixes for Windows 7. At that time, officials said to expect at some point that Microsoft would move to a monthly patching model for Windows 7, 8.1, Windows Server 2008 R2, Windows Server 2012 and Server 2012 R2. As of today, August 15, we now know when the monthly patch rollups for those operating systems will commence: October 2016. Microsoft is moving to the same monthly rollup model for the .NET Framework in October, too. A rollup is simply multiple patches rolled together into a single update. These rollups will replace individual patches for these platforms.
Microsoft finally released the second cumulative update for Windows 10 1809 this week, two weeks after the corresponding updates for earlier supported versions of Windows 10 were delivered. As noted by Ghacks, the second cumulative update for version 1803 arrived on March 20. The delay could be because Microsoft is doing more testing before releasing cumulative updates to Windows 10 1809 after all the problems it's faced with this version and subsequent updates. Version 1903 brings the new Windows Sandbox for safely opening untrusted files, separation of Cortana from Search, a new Windows'light' theme, and more. It's also likely to be the first version of Windows 10 to benefit from Chrome's new support for Windows dark-mode setting.
Microsoft has just fessed up to a couple of the known bugs in this month's Win10 version 1709 cumulative update, KB 4054517 – in particular, the stall at 99% download, and the completely bogus warning that the patch had failed to install with error 0x80070643. Sadly, several other problems with KB 4054517 have not been acknowledged.