Cannot get unity hololens project to work - unity3d

I'm trying to get a project to work that i downloaded this link over here, from github.
I've followed all the (configuration) steps in the install guide and i am using the exact versions of the software as described in the guide.
The problem seems to be that some references to the Windows namespace do not work.
I've tried adding it but i can't get it done in the usual way.
The error messages i get when building in unity:
When i open the project in visual studio 2015 update 3 (after building it in unity):
It seems that the option to simply add the reference in visual studio is not present in this kind of project.
I think this shouldn't be to hard to resolve but i lack the skills and experience as i usually develop windows apps solely in visual studio.
EDIT
These are the configurations I used:

i open the project in visual studio 2015 update 3
You should use Visual Studio 2017 with the latest Win10 SDKs.

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Metadata file '...\GeneratedProjects\UWP\Assembly-CSharp-firstpass\bin\x86\Release\Assembly-CSharp-firstpass.dll' could not be found
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I'm aware of the similar question here but uninstalling and installing the latest versions of both Unity and VS did not help. Neither did starting a completely new project. I'm using now the latest versions of Unity (2017.1.0f3) and Visual Studio 2017 (15.3.0).
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Update
I found this post on Unity forums and I think it's the same issue I have: https://forum.unity3d.com/threads/net-scripting-backend-and-visual-studio-2017-3-incompatibility.487833/
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