Office 2013 - reset license key without disinstallation

Hi,

I have a big problem: 10 office 2013 Retail box ;-).

I installed 9 office 2013, on my live.com account I see all my 10 Office 2013 download link.

The problem is: I don't remember what's the right License for my tenth computer, I have a message that say: " I exceed the limit number of activation for my license".

I search a way to change my license key, without remove everytime office 2013 (or restore it), to reset the license activation procedure.

On my live.com site I can't see any license suggestion, only the download links for my 10 office 2013.

Thanks for help me

Best regards

Faye Müller