I have recent reprogrammed the Vicon Pegasis plugin to work in Unreal 4.9.2 to the latest 4.10.4. Due to license restrictions, I cannot provide you with the source code. However, if you contact Vicon they will be able to provide you with my newer plugin binary. Alternatively, if you contact me directly at our Mocap Studio in Portsmouth we can help you.
Our email is:
You can see my version of the plugin in action at: