I'm trying to install the phone/tablet version of YouTube on my Mi box (intl version). I should be able to figure this out, but I'm stumped. I dl'd the no dpi arm 64 version from July 15, 2017, but it won't install. Any clue as to what I'm doing wrong? And yes, I have unknown sources checked.
I don't know for certain what architecture the device uses, but perhaps try a "regular" ARM apk over the ARM64 one?