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Hi, good day!
Microsoft has begun implementing and releasing Optional preview updates that are typically released on the 3rd or 4th week of every month. These updates allow admins to test the patch before its mandatory launch on Patch Tuesday (2nd week of the month). If you are not experiencing any issues with your system, there is no need to install the preview update.
To prevent optional preview updates from appearing and installing, press Start > Settings > Update & Security > Windows Update. Toggle off "Get the latest updates as soon as they're available" option. Restart your computer.