I have windows 10, I also have the same issues you are having. I have been trying to make my EyeX work with Vjoy and elite dangerous for the last 4 days. I have not been able to get it to work yet.
I was seeing that “does not match Vjoy Dll” but it depended on which version I installed and if I installed the companion apps with Vjoy. Currently I have eliminated that error but still not working.
Right now after my 50th or so uninstall/reinstall of Vjoy, Tobii software, X52 drivers… I am out of ideas and getting ready to send the Eye X back since it just wont work with my system. What sucks… the EyeX does work but only within its own software which for all intents and purposes it completely useless since it doesn’t have the ability to control any of my software without Vjoy working.
Seems to me Tobii needs to write its own interface software and cut out Vjoy. It doesn’t seem like a good idea to be at the mercy of a 3rd party program.