EViews.com

I was able to create an iss file to silently install the software.

Is it possible to automate the registration, or to somehow incorporate the registration key into the silent install so that we don't have to go back and manually login, launch eViews, then register them one-by-one?

Unfortunately you can neither automate the registration nor enter the registration key for silent installs.

We have added some new features in EViews 8 to better accommodate silent installations but not for 7.