Change product key - Office 2016

If you entered wrong product key (eg. one that has already been used), official documentation says to uninstall and then reinstall Office 2016. Bonkers, right?

There is command line tool to fix this.

1. Open Command prompt (Win+R, then type "cmd")
2. Type:

cscript "C:\Program Files\Microsoft Office\Office16\OSPP.VBS" /inpkey:{product key}

3. For 32-bit Office, use "c:\Program Files (x86)\" instead
4. To verify, type:

cscript "C:\Program Files\Microsoft Office\Office16\OSPP.VBS" /dstatus