Question: Maple 11 will not run because of an invalid or missing license file (mac OS)

I'm a new mac owner and for a course i need to download and use Maple 11. So I installed it and opened it...andrun for 15 seconds but then a warning will pop up saying Maple Initialization Error and then "invalid or missing license file" followed by computer jargon i can't even understand. I've looked at Maple and Mac support sites alike to no avail. I suspect it had something to do with my firewall, in which case i'd be grateful for so direction on how to correct it. Thank you for your time. sincerely your friendly Maple 11 (would be) user
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