For me it was an icon next to the clock. Once I reserved my upgrade I just hid it in the action center and it never popped again.
That's like you know there's a hissing cockroach living under the sink but you just close the door and stick your fingers in your ears.
This is because Microsoft will release "updates" to that package, with the totally unintended side effect of unhiding and reinstalling the update. So even if you uninstall it, and hide the update from WU, it will still find a way onto your system.
So yeah, like I said and despite the downvotes, it's fucking adware. Bordering on malware.