I've forwarded this on to the business analysts who will see to it that you get a license file.
For others who have encountered this problem, here are some steps you can take to self-solve.
1) Make sure you have the correct siteid. Note that they sometimes change. If you cannot locate your paperwork, look inside the most recent license file you have and compare that siteid with the one you tried to use. If that doesn't resolve it, use one of the options below:
a) Contact your local sales office. If you don't know who to contact, look here: Mentor Graphics Worldwide - Mentor Graphics
b) Contact Mentor Graphics at 800-547-4303, and select option 2 (for non-technical or licensing help). Follow the phone prompts.
c) To inquire about re-reinstatement of support, click here:Mentor Graphics SupportNet:
Mentor Graphics Customer Support