Before installation, please download 2 sample databases from below,
Open SQL Server Management Studio, Right click on “Databases”, select “Restore Database”,
Select “Device” and click button on the right,
Click “Add” button,
Select AdventureWorks2014.bak, click “OK” button.
Click “OK” button
Click “OK” button.
AdventureWorks2014 has been installed.
Please refer above steps to install AdventureWorksDW2014, it’s exactly the same steps.