To upgrade your current version of ActivInspire to the Professional edition, click on Help>About>Register. Fill in these details, where the activation key field is, enter the ActivInspire activation key from your ActivBoard (which starts with 0015/0016). Or if you are on a Mac, click on ActivInspire>About ActivInspire>Register.
I hope this information helps.
Thanks, Adam Promethean Technical Support Case 679700