Steps for installation of reporting services Add-in for SharePoint Products in SQL Server 2012:
Run the SQL Server 2012 Setup file and follow the installation steps till you get the below installation type page and select the "Add Features to an existing instance of SQL Server 2012"
Click On Next and select the "Reporting Services Add-in for SharePoint Products" in Feature Selection page.
Click on Next and Follow installation steps to complete the installation..
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