Problem activating Combustion

Well last night I installed 3ds-max as well as combustion but waited to activate it until now. 3ds-max activated fine but when I got to combustion it gave me an error that says “Grace Period has ended(0 of 15 days left)” and it won’t get me an activation code giving me another error saying “Bad data”. I’ve checked my serial number and it is fine.

What else can I do?

RESOLVED I didn’t realize that autodesk had a web based activation system. If anyone else has this problem go to and you can register it right from your browser.