Here is a link to their latest Windows Version that allows connection across subnets:
EShare Technology Corporation just provided me with their updated EShare Windows App that allows you to connect across subnets.
It does not install it runs as a standalone executable that you place on your desktop. When it is launched it goes out and discovers devices on the subnet it is connected to and then pops up a security message asking for permissions. Once you are past that you can connect to another EShare device on a different subnet but you have to know the IP address.
To connect select the “Switch” button in the upper right corner then enter the IP address and share screen. It is not perfect but it does allow connect across subnets.
EShare app for windows from http://d.eshare.tech/winclient.php