Well, the .lic extension makes it at least try. Now it claims it's in invalid license key. Awesome.
I must say, Keysight's website is horrendous. I couldn't even register my product. I was trying to log onto Keysight Care...no go. Apparently, that's for corporate customers.
Then I just searched for "Register" and clicked on the result for "register your product", and that's a 404.
So I called them. Turns out I have to register it through Infoline. But I couldn't add an asset there. The rep on the phone had to open a ticket with someone else, who ended up doing it the next day.
Very odd.