1. Create the registry key: [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Office\12.0\Word\InstallRoot]
2. And then create a value for "Path"="C:\Program Files(x86)\Microsoft Office\Office15\". (Or, copy-paste the Path value from HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Office\15.0\Word\InstallRoot)