If you purchased Office 2016 online, it is linked to your Microsoft account. Sign in to your Microsoft account on the Office website. Go to the section. Locate Office 2016 and install or activate it. What to Do If Activation Fails
Right-click on the office_activator.bat file and select "Run as administrator" to execute the script and perform the activation. Activate Microsoft Office 2016 Txt
This is the most common error.