Trying to quit 'Insider'

None of the emails I had registered with Microsoft worked with the Leave Insider link.

After Microsoft telling me I had to rebuild my entire computer to leave insider, I found this.

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Unlink you Insider account in settings.

Delete registry key

 HKEY_LOCAL_MACHINE

        SOFTWARE

             Microsoft

                  WindowsSelfHost"

Turn OFF optional diagnostics

Delete the contents of

   C:

         Windows

             SoftwareDistribution

                    Download

and restart.

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It worked

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Sorry I had to break up registry key and explorer link and can't post link to article.  I kept getting this error:

Content Not Published

Your post contains invalid HTML. Remove the following invalid tags before publishing: p (data-prewrap)

If you want to leave the Insider Program, the primary way to do this is through the Windows Settings app. Since you mentioned there is no "Leave Insider" option in Windows Update, make sure to follow these steps:

1. Go to Settings: Press Windows + I to open the Settings app.
2. Navigate to Update & Security: Click on "Update & Security."
3. Windows Insider Program Tab: Here, you should see an option for "Windows Insider Program" on the left. 
4. Click on it.
5. Leave the Program: If you see the option "Stop getting preview builds" or "Leave the Insider Program," you can select that. If the option isn’t there, that may indicate you're on a different channel.

Although you mentioned that you couldn't find the 'Leave Insider' option, ensure you navigate correctly. Go to Settings > Update & Security > Windows Insider Program. If you're still showing as part of the Insider Program here, there may be an option to leave the program. If you are on the latest build, it could also be that the options are sometimes limited based on the current version you have.