Thanks Dan. I have had a response from WD Support confirming that Quick View will not install on 10.12. However it goes on to say that in order to use the WD My Cloud drive this software is not vital or necessary, this software only shows the drive’s status as its name says “Quickview”, it is just a quick view to the drive status. But you can verify the drive’s status by accessing the drive’s dashboard.
That’s true, is not needed. Anyway the similar replacement for this app is WD Access and you can install it on Sierra. I just posted that workaround as seems to work fine and there are people that still wants to use Quick View.
No WD software is needed for local access and control of the MyCloud. All control can be done via the Dashboard. (Oh, apart from safe shutdown of v2 devices, due to some strange decision by WD to hide the control in the UI; it can be done via SSH, though).