Windows.Mvvm 0.3.7 

dotnet add package Windows.Mvvm --version 0.3.7                

                    
                

            
NuGet\Install-Package Windows.Mvvm -Version 0.3.7
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="Windows.Mvvm" Version="0.3.7" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
paket add Windows.Mvvm --version 0.3.7                

                    
                

            
#r "nuget: Windows.Mvvm, 0.3.7"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
// Install Windows.Mvvm as a Cake Addin
#addin nuget:?package=Windows.Mvvm&version=0.3.7

// Install Windows.Mvvm as a Cake Tool
#tool nuget:?package=Windows.Mvvm&version=0.3.7

The MVVM Framework is a compact and simple, yet powerful implementation of the MVVM pattern for UWP. It provides a strong model for managing the application lifecycle and the navigation. The MVVM framework decouples operation system functionality from the application logic by providing a powerful service system, which abstracts away any platform specific code from the application logic. Everything in the framework was build with the task awaitable pattern in mind, from application lifecycle management to navigation. The framework plays nice with all kinds of frameworks, for example the dependency injection mechanism build into the framework does not care what

Product Compatible and additional computed target framework versions.
Universal Windows Platform netcore50 is compatible. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

This package has no dependencies.

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Now there is a boolean IsExecuting property in the reactive commands in addition to an observable. Also updated all NuGet packages to their latest versions.