To do this, you will have to uninstall the update called KB3035583 that brought it in the first place.
Launch Control Panel —> and then click on Windows Update.
Click on View Installed Updates.
In the Installed Updates window, look for the KB3035583 update. You can either scroll down until you see it, or you can use the Search field from the top right corner of the window.
Select the KB3035583 update with a click or a tap and then press the Uninstall button found at the top of the updates list.
Confirm that you want to uninstall this update and wait for the process to finish. Then, reboot your device.
Now, the “Get Windows 10” app is removed from your system. However, we are not done yet. If you never want to get it again, you’ll also have to hide it from Windows Update, so that it doesn’t get installed again on your device.