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Ensure that you have the latest version of SQL Server Management Studio v17 installed on your worksation, available from from Microsoft via SQL Server Management Studio v17
Download and run the SSDT installer for VS 2015 from Microsoft.
Select the SQL Server Reporting Services (optionally you can also install Analysis and Integration Services) and click Next.
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You should now have an entry for SQL Server Data Tools 2015 in your Start Menu.
To ensure you're ready to develop reports, click on File > New Project and ensure that Business Intelligence and Reporting Services show.
