Can't update to iOS 16 using iTunes
I have an iPhone X on iOS 14.5 and I've been trying to update to iOS 16 through my PC's iTunes program (as I always do, so I don't have to clear out as much space from my phone), but every time I click the "Update" button, it clicks, but nothing happens. I've clicked and waited multiple times for the download of the new version to start as it usually does, but nothing happens. I should have the latest version of iTunes, and it doesn't even give me an error or message or anything, just nothing happens. I've never experienced this before, and I update this way every single time.
iPhone X, iOS 14