[Presto]

I tried to download Office 2016 again, but the page that has the key and the download link says it's expired and not available anymore. The code flashes up for a moment, too. Here's how to get around that:

1. Right-click on the page, and click View Source. A window will popup that has all the HTML.
2. Press CTRL+F and type unit into the search box.

There should be 3 results. The URLs will look like this:
http://www.microsofthup.com/hupca/unitdownloader.aspx?receipt_id=844364505&cultu re=en-CA&id=g506f64303235h3d23ed3387ecb19883fe78e673 dd&dname=O16.download.name.32

You should be able to click the URLs right from the page source. Otherwise, copy and paste it into a new browser.
The first 2 URLs will download the 32-bit installer. The 3rd URL will download the 64-bit installer.
The product key will be in the filename of the installer. You can also find the product key the page source by searching for fpp. It'll be on the line below that result.