George,
Thank you for posting the download link.
Up until now, I have been addressing the problem strictly from Sam’s questions at the top of this thread, and never paid much attention to the link itself. As I said earlier, PHP is an extension of a programming language used for many things, among them,
Internet Software Delivery. 
By reading your recent post, which included the link address, I am close to 100% correct that this language is being used by MTU exactly for this purpose:
For Internet Delivery of MTU Software.
I am afraid the only recourse Sam has, is to contact MTU directly on Monday, for a new download link as his current one appears to be corrupted or non-functional.
As always, MTU will work with him to solve his problem.
Best regards,
Jon