Hello Dave,
this is not 100% correct as you can download the 5.4.4.7609 from => here<=
Certain circumstances may require you to downgrade but these are individually discussed when opening a separate support ticket.
I have removed the commercial reference from your reply as we do not allow this.
Please post your Polycom reference usually starting with 1- so I can look up your individual case.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Best Regards
Steffen Baier
Polycom Global Services