Windows 10 Disable update popups

That's partially because Microsoft has attempted to fix their W10 AU (Anniversary Update) for almost 2 months now on the v1607 AU update and it is being pushed out to all W10 users in great numbers and frequency. My desktop PC got 3 update attempts this week alone. You can minimize this but at present there is no good solution to keep the popup or the update itself from coming into your computer. You can however try to keep it out by disabling your WUDO settings entirely as here:
Windows Update Delivery Optimization: FAQ.

You can also try using pop-up blockers such as Google Toolbar (the only safe toolbar) or pop-up blockers contained with popular security suites such as Norton Security, Avast Internet Security, McAfee Internet Security, and TrendMicro. There are some various fixes coming out to fix the notification issue, but these require using registry tweaks which I don't like to use.

You'll never completely get rid of update notifications from Microsoft unless you disconnect your computer from the Internet completely. The Internet is completely built-in to W10 and it's only going to get more integrated as Microsoft announced last July 29th, not less.

Best of luck,
<<<BIGBEARJEDI>>>