Hi Peter,
Since you were posting these questions during the weekend, I’m just going to assume that you were frustrated that there were no fellow peer to help you out. Tobii staff are only covering the forums during office hours (CET). I try to review the developer-specific topics about once a week but that is not always feasible.
We are able to run the EyeX demo scenes without any problems with the following:
– EyeX SDK for Unity 1.5.466
– Unity 5.1.0f3
– Windows 8.1 and Windows 10
When everything is copied and built correctly, the 32 bit version of Tobii.EyeX.Client.dll should be in the Assets/Plugins/x86 folder, and the 64 bit version should be in the Assets/Plugins/x86_64 folder. (See http://docs.unity3d.com/Manual/PluginsForDesktop.html). Can you check that this is the case? (What tool are you using to check the bitness of the dll? I use the Visual Studio native tools command prompt, and from the folder containing the dll, I run dumpbin /headers Tobii.EyeX.Client.dll | find "machine").