clarify that you need to install from source code

Author: jodebrui

samples/databases/wide-world-importers/power-bi-dashboards/README.md

@@ -35,7 +35,7 @@ To run this sample, you need the following prerequisites.
 **Software prerequisites:**
 
 <!-- Examples -->
-1. WideWorldImporters and WideWorldImportersDW sample databases running in SQL Server 2016 (or higher) or Azure SQL Database. Download page: [wide-world-importers-release](http://go.microsoft.com/fwlink/?LinkID=800630)
+1. [WideWorldImporters](../wwi-ssdt/) and [WideWorldImportersDW](../wwi-dw-ssdt/) sample databases running in SQL Server 2016 (or higher) or Azure SQL Database. Install from source code. 
 1. Power BI Desktop. Download link: [https://powerbi.microsoft.com/downloads/](https://powerbi.microsoft.com/downloads/) 
 
 <a name=run-this-sample></a>