Currently, I am running version: 2.1.3.120 and getting a message that a "Platform Update Available". Clicking on Available and after a few seconds, of blue streaking lines, the message appears that no update is available. Yet I still have the same notification and of course the red circle with a 1 in it.
Might want to reboot your hub if the update is still not available.
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Settings: Reboot Hub.
When it comes back, try the upgrade again. 
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I am now the proud Papa of a brand spankin new Ver 2.1.3.125.
Rebooting took care of it and no lingering messages.
Thanks Folks
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