Did not auto-update program?

My icon on my taskbar looked different, so I opened AdGuard to find there was a version update available. In settings I have it set to "Silent automatic update", so why did I have to manually click "update"? Or would it have automatically updated if I let it go longer (like is there a set time like a couple days before it automatically updates to the new version)? If I didn't have the icon visible I wouldn't have known about the update.
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