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Welcome to Justanswer.com, my name is Dustin.I'm sorry to hear about the issue you are having, I will do my best to help you resolve it.
Have you already resolved this issue?
If not, I need to know if you are trying to install outlook 2016 on a PC, or a Mac?
Also, do you know the Microsoft account / office account email address that you registered with when you purchased Outlook 2016 / Office 2016 ?
Thank you for your response,Dustin S. Sr. Technician and Former Network Switching Systems Operator . Maintainer 31F1P