Software now says my serial number is invalid

Hi there,

I have had articulate storyline for a year now and now when I try to either open up an old file or create a new project it tells me that my free trial has expired and asks me to enter my serial number.  When I enter my serial number I get a message saying that it's invalid. I've had the program running well for a long time so I don't know why this is happening now--and now I can't use it at all.

Help??

Thanks!

Jody

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