Policy
Allow Automatic Updates immediate installation
Specifies whether Automatic Updates should automatically install certain updates that neither interrupt Windows services nor restart Windows. If the status is set to Enabled, Automatic Updates will immediately install these updates once they are downloaded and ready to install. If the status is set to Disabled, such updates will not be installed immediately. Note: If the "Configure Automatic Updates" policy is disabled, this policy has no effect.
4d8efe629cdd ImmediateInstall_Title Registry
Copy registry mappings
HKLM\Software\Policies\Microsoft\Windows\WindowsUpdate\AU\AutoInstallMinorUpdates (enabled) = 1
HKLM\Software\Policies\Microsoft\Windows\WindowsUpdate\AU\AutoInstallMinorUpdates (disabled) = 0 Policy notes
Specifies whether Automatic Updates should automatically install certain updates that neither interrupt Windows services nor restart Windows. If the status is set to Enabled, Automatic Updates will immediately install these updates once they are downloaded and ready to install. If the status is set to Disabled, such updates will not be installed immediately. Note: If the "Configure Automatic Updates" policy is disabled, this policy has no effect.