Hi Salim,
You need to compile the plugin first.
Please check out the getting started guide:
http://ar.uplugins.com/getting-started-full-version/
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CREATING THE SAMPLE PROJECT
To create the sample project follow the steps below: a. Windows -
Install Visual Studio 2015/17 – community editions are also working
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unreal engine editor
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Create a new C++ code project without starter content
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Copy all files from SampleProject directory to your new project directory
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In UE4 editor File -> Refresh visual studio project (optional)
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Exit from unreal engine editor
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your new project from epic launcher
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Click on rebuild missing DLLs when prompted
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Optional: Click on File -> Package project -> Windows -> Windows 64bit