Microsoft indicates that users of Windows 10, version 1809, who have recently received notification alerts for the installation of Windows 10, version 1903 close and update at a later time.
"The update remains in your control To install the update, you must select one of the following:" Choose a time, "" Restart tonight, "or" Restart now, "it says in a recent release Windows 1
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Devices running the October 2018 update may decline the update by clicking the arrow in the upper-right corner of the 1903 Windows 10 Update Notifications.
Customers who have already upgraded their Windows 10 version 1809 devices You can downgrade to the previously installed Windows 10 version by clicking the Start button and then Settings > Update & Security > Click to restore a Then select First Steps at previous version of Windows 10 .
For instructions on how to return to the previous version, see the support document Restore options in Windows 10.