Default [Q] Metrotalk xap file on Windows phone 8.1

So MetroTalk is no longer available to download but I heard it still works.

You can still download the xap file from the marketplace.
However emailing it to myself and placing it on the internal memory and going to the app store, it shows it under "Unsupported apps and games"

My device is in developer mode, is there any way to install it anyway?

EDIT: Just realized there was another thread about this below.
Sad to see Windows Phone has gone completely locked.