I did exactly that, Uninstall from Control Panel and then run o15-ctrremove.diagcab, reboot, run again, just in case o15-ctrremove.diagcab and reboot, again. Then I try to install it from the img as I did the first time and again I got office 2016. Im not sure what it is wrong. In the image I got D:\Office\Data\16.0.10730.20102
Office 2016 registry files might still be present and were not deleted. Use "Revo uninstaller" and choose "Advanced" scan under it. It will definitely find the leftovers and will remove them.