To stop automatic updates in Windows 10 open the Settings app, select Network & Internet, scroll down, and select "Advanced options" below the list of Wi-Fi networks. Enable the "Set as metered connection" option. This option only affects the Wi-Fi network you're currently connected to, but Windows will remember this setting for each individual Wi-Fi network.

After enabling this option, Windows Update will say "Updates are available. We'll download the updates as soon as you connect to Wi-Fi, or you can download the updates using your data connection (charges may apply.)" By marking a connection as metered, you've tricked Windows into thinking it's a mobile data connection — for example, you might be tethering your PC to your smartphone. You can click the Download button to download and install updates at your leisure.