could not install extended WPF toolkit(latest version) on visual studio 2013 - wpf

Question

I have tried so many times install wpf extended toolkit via Nuget.Here I got an error
You are trying to install this package into a project that targets '.NETCore,Version=v4.5.1', but the package does not contain any assembly
references or content files that are compatible with that framework. For more information, contact the package author
How to resolve this issue

Answer 1

So I created a blank C# WPF Application solution/project and then went to the project properties setting the framework version to v4.5.1. Next I went to Tools -> NuGet Package Manager -> Manage NuGet Packages for Solution and in the search filter type WPF Extended Toolkit. This should list v2.5.0 of the Extended.WPF.Toolkit with the Plus version underneath.
By default, any project you have available should be listed on the right hand side as ticked for install if you don't already have the package installed. Click on Install which should give you a preview window saying what it is going to do and confirming will action the change.
In the Output Window, it should be selected to the Package Manager in the drop down and there it will list what it has done. If this fails, can you copy the content of the Package Manager output and paste it in here for us to see.
It should look something like this:
Attempting to gather dependencies information for package 'Extended.Wpf.Toolkit.2.5.0' with respect to project 'WpfApplication1', targeting '.NETFramework,Version=v4.5.1'
Attempting to resolve dependencies for package 'Extended.Wpf.Toolkit.2.5.0' with DependencyBehavior 'Lowest'
Resolving actions to install package 'Extended.Wpf.Toolkit.2.5.0'
Resolved actions to install package 'Extended.Wpf.Toolkit.2.5.0'
Adding package 'Extended.Wpf.Toolkit.2.5.0' to folder 'c:\users\netniv\documents\visual studio 2015\Projects\WpfTestApplication1\packages'
Added package 'Extended.Wpf.Toolkit.2.5.0' to folder 'c:\users\netniv\documents\visual studio 2015\Projects\WpfTestApplication1\packages'
Added package 'Extended.Wpf.Toolkit.2.5.0' to 'packages.config'
Executing script file 'c:\users\netniv\documents\visual studio 2015\Projects\WpfTestApplication1\packages\Extended.Wpf.Toolkit.2.5\tools\install.ps1'...
AutoHides : False
Caption : Loading...
Collection : {Microsoft.VisualStudio.Platform.WindowManagement.DTE.WindowBase,
Microsoft.VisualStudio.Platform.WindowManagement.DTE.WindowBase,
Microsoft.VisualStudio.Platform.WindowManagement.DTE.WindowBase,
Microsoft.VisualStudio.Platform.WindowManagement.DTE.WindowBase...}
CommandBars : {URL Toolbar, F1 Disambiguation Toolbar}
ContextAttributes : System.__ComObject
DTE : System.__ComObject
Document :
HWnd : 593536
Height : 856
IsFloating : False
Kind : Tool
Left : 31
Linkable : False
LinkedWindowFrame : Microsoft.VisualStudio.Platform.WindowManagement.DTE.WindowBase
LinkedWindows :
Object : System.__ComObject
ObjectKind : {E8B06F52-6D01-11D2-AA7D-00C04F990343}
Project :
ProjectItem :
Selection :
Top : 106
Type : vsWindowTypeToolWindow
Visible : True
Width : 1623
WindowState : vsWindowStateMaximize
HasBeenDeleted : False
Events : Microsoft.VisualStudio.Platform.WindowManagement.DTE.WindowEvents
VisibilityEvents : Microsoft.VisualStudio.Platform.WindowManagement.DTE.WindowVisibilityEvents
Rect : 31,106,1623,856
OutstandingEventCount : 0
Successfully installed 'Extended.Wpf.Toolkit 2.5.0' to WpfApplication1
========== Finished ==========