Sorry but it is not solved, at least not for me. Unable to install the Tobii core program, i cannot test the fix for vJoy. Maybe some advice on how to remove ALL entries from Windows 10 v1.803 registry? The advice on this page:
https://help.tobii.com/hc/en-us/articles/115004526774-Installation-or-setup-issues does not help. Cannot install because at first it stays at 50% for a long time, next time i try it says it is already installed, but nothing has been written to harddrives.