Windows 10 Release Information
https://docs.microsoft.com/en-us/windows/release-health/release-information
------------

Prevent Windows 11 Update
  Registry
   HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate
    DWORD -> TargetReleaseVersion, Value 1
    STRING -> TargetReleaseVersionInfo, Value <release version to remain on, i.e. 21H2>
   
  Group Policy
    Computer Configuration > Administrative Templates > Windows Components > Windows Update > Windows Update for Business
    Select the Target Feature Update Version
    Enabled, <release version to remain on, i.e. 21H2>
------------


Stop Pending Windows 11 Upgrade
  
  Delete / Move the contents of C:\Windows\SoftwareDistribution\Download folder

  and / or

  Delete this Registry key:
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsSelfHost
 
  Restart your PC.
------------


Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate]
"TargetReleaseVersion"=dword:00000001
"TargetReleaseVersionInfo"="21H2"