I want to install App Builder on my local server and access within the network so what is the procedure and where can i download the setup?
Here is the main Web AppBuilder page with the download link at the top:
Web AppBuilder for ArcGIS (Developer Edition) | ArcGIS for Developers
Nest use the getting started help page for the install directions:
Get started—Web AppBuilder for ArcGIS (Developer Edition) | ArcGIS for Developers
You may also want to have a look at:
Running ESRI Web AppBuilder on an Intranet