WindowsMixedReality | The Windows Mixed Reality platform components | Augmented Reality library

The problem
To sum up, both Unity and Visual Studio 2017 builds the project, deploys the project, but once opening the app, nothing appears, not even a Unity splash screen. However making the bloom gesture on HoloLens proved that the app is "open" and closable, but that's as far as it gets.

What we tried
Our deployment target is a HoloLens 1 running the latest OS for said device (10.0.17763.380).
We went through the provided solution here: MRTK (V2) Need to update Hololens?

As can be seen in below image:
NOTE: Images below shows Visual Studio 2019, but we tested both cases with Visual Studio 2017 AND Visual Studio 2019.

We installed the Windows 10 Insider Preview SDK (Pardon the Danish)

And tried to follow the solution provided here: Cannot build with MRTK v2.0.0-RC1

Which seems to conflict with what the other answer to the problem seemed to be.
This solution-attempt however provided another error, saying that the deployment target (HoloLens 1) had to run OS 10.0.18326, which makes sense as this OS does not exist for this particular device as far as we know. We're as previously mentioned, running on the latest OS which is 10.0.17763.

As far as changing the C# language to 7.2, we had troubles dealing with that as all guides says to access the language from Build in the Solution Properties but we were unable to find this tab. Here's what happens when we attempt to press "Properties" after right-clicking the projectname.sln in the Visual Studio hierarchy:

However, we hoped we could change the language settings as in here:

but as you can see, there's no "Build" tab, and what we see looks a bit far from what we're suggested should be shown.

What we hoped for
A working HoloLens 1 app that can be opened up, like with the MRTK v2 Beta version.

What actually happens
As mentioned in the problem, the app gets built and deployed, but not only is it filled with errors, nothing appears on opening the built app.

Unity errors can be seen here:

I am facing issue when I build the MixedRealityToolkit-Unity(V2) sample project,I faced the following error :

Assets\MixedRealityToolkit.Providers\WindowsMixedReality\WindowsMixedRealityArticulatedHand.cs(418,73): error CS0246: The type or namespace name 'HandJointKind' could not be found (are you missing a using directive or an assembly reference?)

Assets\MixedRealityToolkit.Providers\WindowsMixedReality\WindowsMixedRealityArticulatedHand.cs(111,17): error CS0246: The type or namespace name 'HandMeshObserver' could not be found (are you missing a using directive or an assembly reference?)

Assets\MixedRealityToolkit.Providers\WindowsMixedReality\WindowsMixedRealityArticulatedHand.cs(382,33): error CS0246: The type or namespace name 'HandJointKind' could not be found (are you missing a using directive or an assembly reference?)

Assets\MixedRealityToolkit.Providers\WindowsMixedReality\WindowsMixedRealityArticulatedHand.cs(412,26): error CS0246: The type or namespace name 'JointPose' could not be found (are you missing a using directive or an assembly reference?)

I am running on Windows 10 Insider preview with OS build : 18362.30 Version : 1903

Also I double checked with build setting Minimum SDK is 10.0.10240.0 Target SDK version is “Latest installed”

I am using mrtk_development branch for the MixedRealityToolkit-Unity.

Can any one help me or guide me if I am missing any steps here for the set-up.

Thanks.