Hi Perry.
Thanks for posting on the forum.
You can download the Mac version of ActivInspire from the below link:
promethean.box.com/ActivInspire2-0 - This is for the UK version for Mac operating system. If you require a different version please let me know.
Once you download and install the ActivInspire software, when you first launch ActivInspire you will be able to enter your Name/Organisation/Activation key, under activation key, please enter your serial number.
I hope this helps.
Adam
Promethean Technical Support
(Case 00429271)