Re: Ah, but...
It isn't licensed for product evaluation, and it's valid to run it inside a company.
their terms for the extension pack are pretty good, in this case it's personal use if it wasn't installed by an administrator, or installed by default on lots of machines.
So if you run it at a company, get the users to install it themselves and you're quite legit.
If you're a big company then you can afford the small price for it if you need it :)