Did you know that the version of Remote Desktop Protocol supported by your Windows clients is critical to successful dynamic virtual channel communications? At a minimum, they should support v8.1 of the Remote Desktop Protocol (RDP).
Newer Windows operating systems support RDP v8.1 or higher but Windows 7 clients do not. The Windows Update mechanism will not automatically provide an update for the RDP version, you must apply these patches yourself.
Here is a link from Microsoft that discusses this issue: https://support.microsoft.com/en-us/help/2830477/update-for-remoteapp-and-desktop-connections-feature-is-available-for We suggest you read all the available information from the Microsoft page.
For Windows 7 computers, you need to follow these steps if the supported RDP version is less than 8.1: