WebStore, MATLAB Activation Key Error #7000

Where can I find the MATLAB activation key and what do I do if I get error 7000 - No License Found when using it?

The University's MATLAB licenses do not make use of an activation key.  Instead choose I have a File Installation key from the Advanced Options Menu and input the File Installation Key found in your Order History after you login to the WebStore.

If you have not yet purchased a license, you will need to do so first. Your WebStore order history will contain a link to the Matlab installation instructions. Please review these so you know what to expect during the installation process.