Hi,
Thank you for writing to Microsoft Community Forums.
We understand your concern, as you are unable to update Microsoft remote display adapter of a remote computer.
In this scenario, we would suggest you to update the concern PC and it should install August 30, 2019-KB4512941 as it addresses an issue that displays a black screen when you use Remote Desktop to connect to a machine running Windows 10, version 1903. Along with the Windows updates, please update the display driver of the remote desktop.
If the issue persist after the update, then we would suggest you to uncheck the box beside Persistent bitmap caching in Remote Desktop Connection for the remote desktop.
Let me point you in the right direction, where you would get the appropriate help for this issue. I would suggest you to post your query in TechNet forum, where we have experts and support professionals who are well equipped with the knowledge on Remote Desktop connection to assist you with the appropriate troubleshooting steps
Aditya Roy
Microsoft Community – Moderator