Cloned PC, changed office key. Got error with license information on restart office. Ativated through CMD and all was OK.
Open CMD as Administrator.
cd c:\Program Files (x86)\Microsoft Office\Office14
cscript ospp.vbs /act
If you want to change product key through command line it is like this:
cscript ospp.vbs /inpkey:XXXXX-YYYYY....