Follow the steps below:
1) Search for services.msc in Cortana/Search box and open it.
2) Find Windows Update in the services list.
3) Double click Windows Update services. In the Windows Update Properties Window, select ‘Disabled’ in the Startup type list box.
4) Click Apply and Ok.
From now on Windows 10 Update process itself will not start in your PC which means you will never get new updates from Microsoft. We recommend using this workaround only when you really want to disable Windows 10 automatic updates. If you want to revert back your changes, follow the same steps again, instead of ‘Disabled’, select ‘Automatic’ in the Windows Update Properties window and apply it.