Windows 10: Microsoft Store is not starting any downloads.

When the "Get" button is clicked, the "Working" indicator flashes up for the skin of a second, and then the entire store page appears to refresh, with no acknowledgement that I have requested the download whatsoever. Checking "Downloads and Updates" gives no indication that the app download request was ever registered with the system.
I have downloaded and used the Win 10 store troubleshooter, turned on UAC, reset the store cache, signed out and back in, and I have even tried troubleshooting Windows Update, and turning off my firewalls and Peerblock. The app I was originally trying to install was "KAUNA" by x2.
I cannot presently find any problems resembling this on Windows forums, or indeed, anywhere else online. Possibly, I am not able to find the correct search terms.
Obviously, this is frustrating, but I am totally out of ideas. Is it perhaps some setting I have changed in Windows somewhere that I am unaware is responsible?

I did try to ask Microsoft directly at answers.microsoft.com, but lo and behold, they won't allow me to post a jot without verifying my account via SMS, which I am totally unable to do, since I am too sodding poor to own a mobile phone. Apparently, calling them to discuss alternative options basically gets me told: "get a phone, or suck it".
Thanks for rubbing THAT one in, Microsoft... *Rolleyes

Any ideas, you wonderfully clever people, you?

:)