Hello,
Thank you for posting in Microsoft Q&A.
Based on the description, I understand your question is related to win 11 upgrade.
You can first disable automatic updates to prevent your system from upgrading to Windows 11.
Open the Settings app and navigate to "Update & Security".
Click on "Advanced options".
Under "Pause updates", select the maximum number of days to pause updates.
After that, configure the group policy or registry for the machines.
Open the Group Policy Editor. Navigate to Computer Configuration > Administrative Templates > Windows Components > Windows Update > Windows Update for Business.
Double-click on "Select the target Feature Update version". Enable the policy and set the target version to version of Windows 10.
You can also use the Registry Editor to block the upgrade:
Open the Registry Editor, Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate.
Create a new DWORD value named TargetReleaseVersion and set it to 1.
Create a new String value named TargetReleaseVersionInfo and set it to 21H2 (or the win 10 version you want).
Have a nice day.
Best Regards,
Molly
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