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1. Press Windows key + R
2. type gpedit.msc, and press Enter to open the Local Group Policy Editor.
3. Navigate to: Computer Configuration > Administrative Templates > Windows Components > Windows Update.
4. Double-click "Configure Automatic Updates".
5. Select "Disabled" to stop automatic downloads entirely
6. Click OK
7. A windows restart seems to be required to apply the setting.

(link to similar EG internal confluence article)