Hi there and welcome
This is a file meant for a windows computer, not for the Mac, this is why you cannot open it.
There is no version of this software for a Mac computer.
Do you have a windows computer available there?
On the windows computer go the same web site address as you did with Safari and you can then download it there and run it.
I can also do these steps for you, and have made a request via Additional Services. This is optional, and if you choose to do this, I can, with your permission, remote into your computer while you watch and do all these steps (and deal with any problems that arise during them) for you. Or if you do not choose to take this service, we can continue here. This is no problem at all. Just let me know please.
Else let me know the results please.