Once in every 6 months, MS is releasing an update which is the result of Windows Insider Build.
So an Insider Build needs to be used for testing purpose.
A stable release should be updated once they are released.
No beta software is perfect. That's why we offer Insiders different versions of Insider Preview Builds. We call them Rings:
- The Slow Ring is for most Insiders who simply want to explore new Preview features with minimal risk to their devices.
- The Fast Ring receives Insider Preview Builds more often than the Slow Ring. It’s for advanced Insiders who want to explore new features even sooner — and don’t mind dealing with the bugs and other issues that come with these builds.
Source:Get Insider Builds - Windows Insider Program
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