If lost, you can look it up at seisimager.com/registration by entering your order number.
For software-only licenses, the program generates a unique Site Code based on your computer's hardware. You must send this code to the software provider, who then returns a matching Site Key (the registration password) to activate that specific installation. seisimager registration password
Summary
Even with a legitimate license, things can go wrong. If lost, you can look it up at seisimager