While Windows 10 version 1909 reminds me of an old-fashioned Service Pack — an update that squashes lots of bugs while tying together pieces that rattle when they run — you must keep in mind that the package includes updates for most parts of Windows.
As such, it’s an upgrade that should be treated with respect — and some amount of trepidation.
To find out, click Start > Settings (the gear icon) > System, and on the left side at the bottom, click About.
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Enterprise and Education users who aren’t connected to a network with an update server can follow along with the Pro instructions below.