nls:
f you have Raspbian Jessie or later, VNC Connect is pre-installed, so only download if your Raspberry Pi has a different Linux distribution.
Uniquely to Raspberry Pi, VNC Connect is also pre-licensed to offer cloud and direct connectivity to Home subscribers.
Does dispmanx-vnc have similar cloud and direct connectivity, and will it work with VNC Viewer or need a different software?
That information is for Raspbian which is not equivalent to OSMC!
Update 2021 (November)
@MarkusLange , has updated his script (check the 2019 update bellow for the link and instructions) to take care of the KMS/fKMS problem with the Pi4 if you are using Kodi version >=19.1, as seen here: [HowTo] Install a vnc server on the Raspberry pi - #482 by MarkusLange
So just use his script to install vnc server on your pi…It is safer than doing it manually.
Update 2021 (September)
In order to make it work on the Pi4, after installation do the following:
Update 201…