Method One: Download and install online

1),  Go to https://setup.office.com and login with your micro account

2),  Enter the key to the form and click "Next"

3),  Select language edition you are requiring and click "Redeem"

4),  Download 64 or 32 bit edition to install

Method Two: Download the Offline startup file first, install and activate application directly

1), Different Language Download Link:
     English Version 
     Arabic Version 
     Brazilian Version
     Croatian Version
     Deutsch Version
     Español Version
     French Version
     Greek Version
     Italiano Version 
     Korean Version
     Português Version
     Slovenščina Version
     Traditional Chinese Version

2), Select language edition you are requiring and download

3), After installed, open any office application and enter product key to activate