Question: how to run uwp app?
Answer: Introduction.
Windows 10 Universal Platform.
Step 1: Go to Visual Studio 2015 update 3.
Step 2: Next step is to select the target version of Windows 10 SDK (Windows 10 Build 10240). ... 
Step 3: Next step is to write the code or design in your app.
Step 4: After opening the MainPage.