Microsoft Office Professional Plus 2016 PC Download Linky
If you select that you are a homeschool teacher no proof is required. Just wait a few hours for the product key and download link.
If you select a school teacher then it will ask for you to upload a paystub, though DDF reports are that even a Student ID upload works.
You should get the download key within a few hours of purchasing and meeting the requirements.
Limit of 1 purchase per person.
The PC version sells for $369.99 from Amazon and includes:
-Full, installed Office 2016 versions of Word, Excel, PowerPoint, OneNote, Outlook, Access, and Publisher for 1 PC (Windows 7 or later, business or home use)
-Easily save your documents online with free OneDrive online storage, available for all OneDrive users
For more info look here