Microsoft Office 2016 update button missing

I just installed MS Office 2016 Pro Plus edition and its build version is 16.0.4312.1000. The problem is that on File -> Account page the update buttons/options are not present below the "About" button. As much as I can remember, the last office 2016 installation I had sometime ago had those options through which I used to update to latest build. How can I get those back? Is there some edition difference?

Note: I tried installing updates through Windows Update. Some updates were installed but the build version was the same!

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