Visio Pro 2016
Thanks for purchasing Visio Pro 2016.
Visit setup.office.com->login or create your MS account->enter key->download
If you have already installed an official copy of project /visio professional 2016 on your computer and want to use a key to activate it directly, please notice that:
You still need to go to setup.office.com to register your key with your MS account and it will be converted to another software key which you can use for direct activation purpose. Please see screenshot below for where you can find your redeemed key (below is an example for project 2016):