If you have an activation code for Microsoft Office 2011 or 2016, you can use the links below to download and install Microsoft Office.
Office 2016: https://setup.office.com
If you do not have a Microsoft account, you can sign up for a free account here: https://signup.live.com
For Office 2010, check the length of your product key and do the following:
If your product key is 25 characters and uses the format XXXXX-XXXXX-XXXXX-XXXXX-XXXXX, go to https://www.microsoft.com/software-download/office
If your product key is 27 characters and uses the format XXXXX-XXXXX-XXXXX-XXXXX-XXXXX-XX, go to https://getkey.office.com/office2010