Hi Stuart,
Thanks for posting on the forum.
Please note that ActivInspire is not currently supported with Mac OSX 10.10 (Yosemite)
You could try to remove your current Java version and run the ActivInspire suite installation, inside this is a Java folder which has the correct Java files which need to be installed.
I hope this information helps.
Adam
Promethean Technical Support
(Case 00457242)