First, it says "Your device is at risk because it’s out of date and missing important security and quality updates. Let’s get you back on track so Windows can run more securely. Select this button to get going:"
Then, I clicked on the button to update, but looks like I got stuck with "Checking for updates..." message.
I checked online for solutions: I disabled the windows update service, then went to C:\Windows\SoftwareDistribution and deleted DataStore and Download folders. I re-enabled the win update service, but I'm still stuck with "Checking for updates..." message.