To download it you have to log to this link : Here ; and click Get the Office 2016 Preview now.
after that choose one link from the two link as showing in the picture bellow :
and after the installation you have to activat the programme and this is the key :
NKGG6-WBPCC-HXWMY-6DQGJ-CPQVG
NOTE:
if you have the office 2013 you have the remove it befor installing the new one .
if you have any problem post a comment pleaz .