I have a Google Pixel and I haven't installed Android updates in a while because I haven't been using the phone. Now I have version 7.1.2 and I want to update to Android 9. I click on System Update or on an update notification, and it takes me to the Android 9 update page. At the bottom, I click on the Download and Install button. It makes the "tap" noise and shows the animation that I've clicked it, but nothing happens after that. It stays on the same page. I've tried restarting the phone, closing apps and everything but it doesn't work.