#1 The way how to disable auto-restart after installing updates is to disable the task in the Task Scheduler:
- Launch the Task Scheduler.
- Go to Task Scheduler Library/Microsoft/Windows/Update Orchestrator.
- Right-click on the task named Reboot.
- Select Disable:
#2 Another way:
- Press Win+R.
- Type gpedit.msc:
- Go to Computer Configuration/Administrative Templates/Windows Components/Windows Update.
- Double-click on No auto restart with logged on users for scheduled automatic updates installations:
- Select Enabled and click OK: